Questions about digital cameras

Digital camera has entered the field of mass consumption. Many friends want to own a digital camera, but they don't know how to choose. As a digital product with high technical integration.

Products, in the purchase process, there will be a question of how to choose how to choose. Now everyone pays great attention to the number of pixels of CCD besides the resolution when buying digital cameras.

In fact, other performance indicators of digital cameras are more worthy of consumers' attention. I'll tell you how to choose the "Best Digital" with real price and practical function from different angles.

Camera ".

First, understand the camera.

1. pixels and resolution pixels are the most basic units of digital images. Each pixel is a small point, and points (pixels) of different colors are gathered to form a moving photo.

Digital cameras often use pixels as the basis for classification, but many people think that the number of pixels is the number of photosensitive points on the CCD photosensitive unit, which is not completely correct.

At present, many manufacturers can produce digital photos with higher resolution under the CCD photosensitive unit with the same photosensitive point through special technology, such as Fuji SuperCCD and Epson.

HyPic technology is based on. What is the relationship between pixels and resolution? How to interpret these two figures when purchasing?

★ The higher the picture resolution, the more pixels are needed. For example, a picture with a resolution of 640×480 needs about 365,438+00,000 pixels, and a picture with a resolution of 2084× 65,438+0536 needs at most 365,438+040,000 pixels.

Sue.

★ The resolution can have multiple values. The more resolution the camera provides, the more flexibility you have in taking and saving photos.

★ The resolution of the picture is related to the imaging size and magnification at the time of output. The higher the resolution, the larger the imaging size and the higher the magnification.

Total number of pixels refers to the total number of pixels contained in CCD. However, due to the lack of light at the edge of CCD, some of them do not need to be photographed. Subtract this part of pixels from the total number of pixels as follows

Is a valid number of pixels. Therefore, when reading the product manual, remember to pay attention to the effective number of pixels that can be used in actual shooting, not the total number of pixels.

2. The quality of the lens and shutter lens directly affects the quality of the camera. Under normal circumstances, manufacturers with deep background in traditional cameras will have better lenses in their digital cameras.

★ Focal length Due to the special lens specifications of digital cameras, it is impossible to predict the range of scenery that can be photographed from this data, and most manufacturers will add equivalents to the lens focal length parameters.

Focal length value of 35mm traditional camera. If it is a souvenir or a photo of life, you only need to buy the fixed-focus lens model. If diversification is needed, it has three times or more optical zoom capabilities.

A camera would be more suitable. Focal length, also known as focal length, usually refers to the distance from the central point on the lens axis to when the image can be clearly imaged, while in a camera, it refers to the focal length of the whole lens group.

, the unit is mm (millimeter). The longer the focal length, the narrower the angle of the visual range of the lens, but it has the effect of magnification and proximity, just like the lens of a telescope; The shorter the focal length, the better the shooting effect.

The larger the perimeter, the smaller the relative object, which is suitable for shooting larger scenes at close range, which is what we often call a wide-angle lens. For digital cameras, the longer the focal length, the more lens groups.

The longer the depth, the more data such as f=5.5mm or 5.5mm can be found from the camera lens. However, the focal length of the lens of a digital camera is generally 35 mm higher than that of a general camera.

The machine is much shorter, so many manufacturers will indicate something similar in the manual: a 36mm lens equivalent to a 35mm camera for users to compare.

★ Aperture range The larger the aperture, the more you can adapt to the lack of light. If there are more than two aperture values, the application flexibility of the camera will be greater. Aperture is one of the important mechanisms that affect exposure.

First, it usually refers to the control device composed of about 5 to 9 metal pieces in the lens group, which can form circles with different sizes to control the amount of light entering the lens. The larger the pore size,

The more light enters per unit time. The size of the aperture is expressed by numbers. The larger the number, the smaller the aperture, that is, the less light enters. The lens marker refers to

The maximum aperture of the lens is the value in the fully open state, such as 1: 3.2, but on the zoom lens, you will see the mark of 9.2-28mm 1: 2.8-3.9, which means the focal length is.

The maximum aperture of 9.2mm is F2.8, and that of 28mm is F3.9.

★ Shutter The shutter of a digital camera can support 2 ~11000 seconds, which can meet the general requirements. Of course, if there is a wider shutter range, it can better meet all kinds of harsh shooting.

Conditions, such as shooting high-speed moving objects or starry nights. The shutter is used to adjust the exposure time of the camera, and the unit is seconds, which is expressed by the reciprocal, such as 30,250.

Thinking is 1/30 seconds and 1/250 seconds, so the smaller the number, the slower the shutter speed. The faster the shutter speed, the easier it is to capture high-speed moving images, and it is not easy to shake when shooting.

The image is blurred, but high speed may lead to insufficient light input. Usually, when the light is strong, you must use a high-speed shutter or increase the aperture. When the light is insufficient, the speed

A slow shutter is more suitable, but a tripod may be needed.

3. Macro shooting Macro is to zoom in and out the subject to be shot. The point is to shoot tiny objects to the size you want. In macro mode, all kinds of digital cameras have different capabilities.

Some can even take a close-up shot near 0. 1 cm.

4. Other functions, such as red-eye flashing, white balance and exposure compensation, will have greater flexibility for shooting in various environments.

★ Automatic white balance correction The photosensitive part of a digital camera is equivalent to the negative of a traditional camera. The photosensitive element of digital camera is fixed, so it needs the ability of white balance correction.

Respond to changes in the light source. It is mainly designed for the light sensitivity in different environments. Different light sources will produce different degrees of chromatic aberration, which may make the color blue and have deviation.

Yellow, white balance correction can be corrected.

★ Exposure compensation Because the camera's automatic exposure function is based on the light entering amount of medium gray reflected light, if there is too much white in the shooting picture (too much reflected light),

The amount of light entering will be higher than the photometric standard value, so it will mislead the camera into thinking that the light is very strong and narrow the aperture, resulting in underexposure of the photo and the white part becoming not white enough. And exposure

To compensate for this situation, increase the exposure of 1 or 2 frames, and have bright and correct images. On the other hand, when most of them are black, it is necessary to reduce the exposure of 1 or 2 squares.

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Many consumers, because they don't understand digital cameras, unilaterally think that pixels are high. Not exactly. When choosing a digital camera, we should consider its digital and optical characteristics.

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1, digital camera lens. A well-designed high-end camera lens is composed of multiple groups of lenses, including aspherical lenses, which can significantly reduce the color shift and minimize the image.

The shape is distorted and deformed, and the material is expensive fluorite or glass. In order to reduce weight and cost, the lenses of household and semi-professional cameras are made of resin.

Into a lens.

2. Image value of CCD of digital camera. CCD is the heart of digital camera, and it is also one of the main factors that affect the manufacturing cost of digital camera. Therefore, it also becomes the division of digital camera files.

An important criterion of time. At present, entry-level products are all 3-5 million pixels, and commercial and semi-professional users prefer products with more than 5-/kloc-0.0 million pixels.

3. Zoom of digital camera. Optical zoom is a real zoom, which will not affect the imaging quality of photos; Digital zoom is electronic zoom, which is based on the loss of photo clarity.

Local amplification of cost.

4. Battery and power consumption of digital camera. Digital cameras have LCD screens and built-in flashlights, so the battery consumption is higher than that of traditional cameras. It is convenient to use the No.5 battery.

Yes, you can buy it anytime and anywhere, but it won't be long before the battery is dead. Therefore, it is best to choose the model equipped with rechargeable lithium battery. At present, mainstream digital products have been designed as lithium batteries.

Battery, and provide complete charging equipment as accessories.

5. Additional functions. The more functions, the more fun and uses it means to use a digital camera. For example, many digital cameras have video output function and can be connected to TV.

Browse photos; Some can set their own startup screen and shutter sound like mobile phones; Some can have short-term digital video recording function. The installation of digital camera driver should

Very simple, you can download pictures quickly, have photo previews and so on. For example, the software function attached to Canon digital camera is perfect, which can classify and manage pictures when printing.

The settings are more diverse, and you can simply modify the picture.

Image sensor is the decisive factor of camera performance. Generally speaking, the pixel value of the image sensor should be greater than the maximum pixel value of the real shot image. Some manufacturers make up for the shadow.

Due to the lack of pixels in the sensor, the software interpolation method is used to increase the pixel value of the image. In fact, this interpolation method can be implemented in almost all image processing software, so it is very practical.

It doesn't mean much. The purchase must be based on the hardware pixel value of the image sensor, not the maximum pixel value of the output image.

Digital cameras record photo information in a semiconductor element called CCD (Charge Coupled Device), instead of the film of a silver salt camera. The CCD size refers to the diagonal line like a TV set.

Length, expressed in inches, such as "1.27 inch (note)". The larger the CCD, the more pixels and the higher the sensitivity. Therefore, with the same number of pixels, the larger the CCD,

The better the picture quality. CCD size 1/2.7 inches (4.0mm×5.3mm) 1/2 inches (4.8 mm× 6.4 mm)1/0.8 inches (5.19 mm× 6.9/.

8.8mm) Note: 1 inch is equal to 2.54cm, and the CCD of digital camera adopts the same representation as that of TV picture tube.

Second, the four basic principles of purchasing machines

● For ordinary home users, if they are limited to family entertainment, they pay great attention to practicality. Powerful functions and high cost performance brought by durability are the first choice factors.

At present, the dominant 3 million and 5 million pixel models in the market can meet the imaging requirements, and they need to have multiple shooting modes, a wide range of ISO values and high-speed and accurate focusing.

Functional characteristics, and ensure the durability of the metal shell is also an essential consideration.

● For consumers who pursue fashion avant-garde, the close combination of shape design and prominent function is the first choice standard. Small shape, bright colors and comfortable feel.

It is necessary, and some highlight functions such as macro shooting function are icing on the cake for this kind of products.

● If you are a professional user, the most important thing is the ultimate pursuit of imaging quality. Manual operation function is necessary, interchangeable lens, CMOS with more than 6 million pixels.

Image sensor and various image recording modes are the guarantee of high image quality. If we have an explosion package price of less than 10 thousand yuan, it will make more professional photographers.

Rush over.

● The last thing to consider is where to buy it. A regular digital camera sales counter will ensure that your camera is "born". Brand effect should be considered when buying, because it is a digital camera.

The main guarantee of overall quality and after-sales service.

Third, the preparation steps for buying a camera

Step 1: Make clear the purpose and purpose of buying the camera.

It is very important to determine the purpose and purpose of buying a camera. Only by knowing your own needs can you choose to buy the machine you really need through mergers and acquisitions. Otherwise,

It is possible to spend a lot of money on a camera, only to find that the functions can't meet your own requirements, or there are too many functions to use at all. We can consider buying a digital camera.

Do sth. For example, some friends buy digital cameras to travel; Some friends want to learn photography; Some friends want to take macro photos; Of course, some people want to shoot people.

For example, close-up photos or taking pictures of newborn children as souvenirs. In short, we must clearly understand consumption.

The output of photos also needs to be considered in advance, whether it is necessary to develop large photos or just watch them on the screen. Through such consideration, we can decide.

Decide how many pixels of machine you need to buy. If we just watch it on the screen, then a 3 megapixel machine is enough. If it is to develop, and it is to develop to 10 inch.

Inches or more, then we need to buy a camera with pixels as high as possible.

Step 2: Decide the psychological price.

After deciding the purpose and use of buying a camera, you should decide an affordable psychological price according to your own economic ability, such as 3000 ~ 4000 yuan or 6000 yuan.

~ 7000 yuan, etc. This can help us save a lot of time and be more purposeful when choosing. DC is still a luxury, so everyone must do their best, and

There is no point in comparing others with others, as long as it is enough.

Step 3: Collect information through various channels.

Early data collection is very important, which can give us a certain understanding of the machine to be purchased. There are many ways to collect product information. First of all, many manufacturers have introduced several models.

When we code the camera, there are always some posters, so we can go to the seller to have a look. Secondly, media advertising is also a very important way. In today's IT newspapers and periodicals,

There are many advertisements for digital cameras, so we should pay attention to them. Thirdly, many digital magazines or some newspapers will have a certain space to introduce digital cameras or digital products.

Camera evaluation, we can also buy some to see.

If possible, you can download the manual of the corresponding camera and have a look. This is good for buying machines: on the one hand, it can make you more familiar with machines, on the other hand, it can make you more familiar with machines.

When I bought it, I was also prepared and could carry out basic operations. I like reading instructions myself.

Technical data can let us know the appearance, function and other information of digital cameras. We should look at the actual photos. In this way, you can know the characteristics of DC you are concerned about.

Such as color, image quality and so on. We can go to the digital photography website to learn about this.

Step 4: roughly determine the model.

The collection of product information is very important, which allows us to fully understand the characteristics of digital cameras. But just looking at these materials, we can only have perceptual knowledge and only go to practice.

Only by looking at the machine or even trying it out can we have a rational understanding of the machine. This requires us to go to the mall. We can look at the prototype in the window or counter, really.

The real machine may look different from the photo, and it may look better. We can also watch others buy machines and listen to what others say. Of course, we can also.

Let the merchant take out the machine, actually touch it and operate it. Depending on the machine, you should also ask the price. When asking about the price, you should pay attention to the fact that the quotation of the merchant usually leaves room for counter-offer.

. Also, ask them if the price they quoted is licensed or parallel.

Step 5: Choose the right time to buy.

After deciding to buy the machine, we should choose "auspicious day" to buy DC back. When I say "auspicious day", I actually want to seize the opportunity myself. The price of digital products is instantaneous.

Interest rates are constantly changing, so it is very important to judge the market. However, obviously, you should avoid buying before the festival as much as possible. There must be a lot of people buying planes before the holiday.

The price will not be cheap.

You must read when you buy a camera.

When buying a camera, you need to check it carefully to avoid buying defective products or being cheated by JS (profiteer). Here we give a detailed inspection step, as long as you follow the following steps.

Do this, there will be no problem:

1. Never pay JS first, and then pay after inspection;

2. See if the packaging is old. If so, it may be replaced by others, or a product that JS has stored for a long time;

3. After unpacking, check whether the accessories in the box have been used or obviously disassembled; Pay special attention to whether there are scratches on the battery pins;

4. Check the appearance of the machine. Look for scratches on the fuselage, including lens, LCD, EVF and shell.

5. Try to shoot, and zoom to see if you can shoot clearly. If you are not familiar with the machine you are going to buy, you can shoot it with an automatic file when you try it out. In addition, flash

The lights have to be tried;

6. Then take a closer look at the LCD and EVF. You can block the lens with your hand, so that you can see the three-dimensional image, or face the black and white paper.

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7.CCD is the key component of DC. If there are bad spots on it, it will affect shooting. Because it is difficult to see the bad points of CCD directly on DC, it is necessary to import the picture into PC and watch it again. if

The merchant doesn't have a computer there. It is recommended to talk to the merchant about a certain replacement cycle, and then go home and feel at ease.

How to test bad points

Before we discuss how to test bad points, we need to explain what bad points are. Simply put, it is a point on the CCD that will never be sensitive, or this point will always be on. through

It's always open, and it's rare not to open. So why is there a bad point? This is related to the manufacture of CCD. Although the technology is very developed now.

But for CCD, high yield is still not guaranteed. Just like LCD, it may be defective. So we need to test the machine after we buy it.

The test of bad points is actually relatively simple. We can test it in two ways: one is to look at the original picture with our eyes. In fact, this method is more intuitive, but be careful, otherwise.

It is easy to miss. The second is to test with software. The most popular bad point testing software is DEADPIXEL. Usually, if there is a computer in the place where DC is sold, this software can be bought there.

Before the test, we should take some all-black photos first. Ordinary photos can't be tested. This is very important. For machines with lens covers, we just need to cover them.

The lens is covered. If there is no lens cover, such as Casio, then we can put a thick piece of paper on the flat panel, put down the DC lens and buckle the lens on the paper to shoot. It must be noted that

It means that the light must not enter the lens, and at the same time, don't use too much force, which will easily damage the machine.

The shooting parameters can be set to the maximum aperture and ISO 100. As for the shutter, we need to choose 1/60 and the slowest shutter. In other words, shoot a lens at different shutter speeds.

Zhang.

After shooting, we can import the photos into the computer and open DEADPIXEL for testing. After opening this software, we can see the interface as shown below. we

Click the "Browse" button and select the photos we need to test. Then we press the test button and the results will appear. If the photo test of 1/60 exceeds 10.

Noise, then try to change one, otherwise it may affect the shooting.

Check that all accessories are there. Usually there is a list in the box, which explains in detail how many accessories are included, and we can compare them.

Selection of accessories

Of course, after buying DC, we need to buy some accessories so that we can shoot better. Accessories are actually important. If you don't buy them properly, it may affect our normal operation.

Shoot me. Usually we may need to buy memory cards, batteries and chargers, UV and adapter rings, camera bags, tripods and so on. Some people like to buy all digital cameras at once.

Qi. I think if you buy these at the place where DC is sold, the price will definitely not be cheap. Except for memory cards, everything else should be bought in a special photographic equipment store, which will not only

Reliable quality and cheaper price. Let's talk about the places that need to be paid attention to when buying these accessories.

Memory card: When purchasing a memory card, you should consider your daily shooting amount and combine your DC to determine the capacity of the card you need to purchase. Secondly, we need to consider the quality of the card.

Cards. At present, there are many card brands on the market, and the brand of the card determines the quality of the card in a certain sense. For example, kingstone)CF card, Toshiba SD card.

Although this brand of card is not very fast, its quality is absolutely first-class and its compatibility is good. Third, consider the speed of the card. The speed of cards sold now is average.

There are two kinds of high-speed cards. If you need to take photos in RAW or even TIFF format, try to buy a high-speed card.

Batteries and chargers: There are generally two kinds of batteries used in DC, one is rechargeable lithium battery, and the other is AA (No.5) nickel-metal hydride battery. My advice to rechargeable lithium batteries is that everyone

Buying in a regular store, on the one hand, has quality assurance, on the other hand, the probability of buying fakes will not be less. For Ni-MH battery, GP mobile Altman battery is not very expensive at present, and its quality is also very high.

First-class, of course, domestic products are not bad. We try to buy something with a larger capacity, such as 2000mAh. For chargers, many digital cameras are given away at random now, so I won't go into details here.

Introduced.

UV and adapter ring: the main function of UV for digital cameras is to protect the lens. Do you need to buy this? I think the first thing depends on what machine you use. If the machine is better than

If it is smaller, it is better not to consider it. Because usually UV can only be installed on the machine through the adapter ring or drum, the volume of the camera is increased. If the machine itself is better than

A bigger one, such as Canon EOS350D, is more suitable. There are many brands of UV, so it is recommended to consider multilayer coating. When buying UV, you should also consider the caliber of UV.

If you are not familiar with this, you can buy it with your camera. In addition, after installing UV, the original lens cover may not be covered. we need

Match one.

Photographic bag: Be sure to consider the location of accessories and bring the machine to buy it. Only in this way can we buy the right one. The bigger the camera bag, the better, but it should be suitable.

Yes In addition, pay attention to the material of the bag and try to buy a waterproof bag.

Tripod: Pay attention to its stability when choosing a tripod, and don't buy a rickety one. In addition, pay attention to the weight. If you are strong and just need exercise, then this or

Maybe it's not a problem. Weifeng brand is the most popular brand in the market. This brand of tripod is cheaper and things are ok. Japanese imported brand Admiralty has a very good reputation.

It has a long history and many top photographers in the world have chosen this brand. The price is not very expensive.

Skills of distinguishing parallel goods from licensed goods

Guests often ask me how to judge licensed goods. Generally, licensed goods are clearly marked. Let me briefly say:

1. Canon: There is an anti-counterfeiting mark on the licensed packaging box, and you can check it by phone if you scrape off the coating; The serial numbers on the packaging box, warranty card and fuselage should be consistent; Canon triad

There is a laser anti-counterfeiting label in the upper right corner of the warranty card, and the warranty card is in Chinese; The instruction manual is a simplified Chinese version.

2. Fuji: At present, all licensed Fuji sold have Chinese menus. If the menu is found in English, it can basically be regarded as parallel imports; The outer packaging of the licensed goods is in Chinese; line

The goods have a simplified version of the instructions; As for the warranty card, Fuji Licensed Products provides a simplified version of Fuji China warranty card in triplicate.

3. Minolta: You can call Shanghai Minolta's toll-free hotline: 8008200077 and ask it to verify the fuselage number.

4. Nikon: Since Nikon has no company in China, sales are handled by several agents, namely Quantum, Lida, Liangchi and New Kang Hua. Every agent has a license.

The identification methods are not exactly the same, but there are still some identification methods. First, we need to see the warranty card. The authorized warranty card is in English with the agent's seal on it. Rough-processed goods

There are simplified Chinese descriptions. Some agents, such as Quantum, put anti-counterfeiting labels on boxes.

5. Olympus: All machines in Olympus now use simplified Chinese menus, but there are still few products with English menus; Secondly, the instructions and warranty cards are also simplified.

Text version; In terms of outer packaging, Olympus is a simplified Chinese version.

6. Sony: The labels of Shanghai Suoguang or Wuxi Sony can be found on the licensed packaging box; The warranty card has the words Shanghai Suoguang; There are simplified instructions. It is sold in China market.

Sony DC or DV are only made in China, as long as they are imported, they are parallel imports. You can see the words CN 1 on the bar code of the outer package. If it is CN5, it is parallel imports.

"7. Casio: After purchasing, customers can scrape off the coating on the anti-counterfeiting label attached to the package to obtain the password under the coating, which can be inquired in three ways:

1. Call 8008 1083 15 for free telephone consultation or 0 10-642 19000 for consultation.

2. Send short messages to 800283 15 (mobile) and 900283 15 (Unicom) for inquiry. "

Note: Now many good digital camera brands have their own websites. Just log on to the corresponding website and enter the body number, and you will know the DC or DV you bought in a few seconds.

No license. If you bring DV or DC from abroad or Hong Kong and Macao, you'd better ask if there is a warranty in China. As far as I know, except Panasonic, other brands have no warranty in China.

Not all Panasonic products are guaranteed in China. At present, most maintenance departments in China are contracted, and if there is no formal warranty, the maintenance fee is surprisingly high.

Pay attention to buying digital cameras

High pixels equals high quality photos?

Many users who buy digital cameras for the first time will take pixels as the primary consideration. In their view, pixels are the basis for judging the quality of digital cameras, as if more pixels are higher.

Coded cameras are bound to get high-quality shooting results. In fact, the relationship between pixels and image quality is far from simple.

One thing is certain, the pixel height does not determine the quality. There are many factors that affect the quality of digital cameras, among which the lens can directly affect the imaging quality, whether it is

Whether it is an optical camera or a digital camera, the lens is one of the most important elements. Ordinary digital cameras use CCD to sense light, which is much smaller than traditional film.

More, this requires stricter requirements on the resolution of the lens, otherwise, even if the pixel is higher, the imaging quality will be worse because of the lens. In other words, digitization.

The resolution of the optical lens used in the camera must be better than that of CCD, so it is much more important to choose a digital camera with high quality lens than just looking at the pixels.

Clean pictures with low noise are always accompanied by high resolution?

Noise is the enemy of digital camera imaging quality. General users will think that a clean picture with low noise always means a high-resolution effect of photos. In fact, for digital cameras,

On the whole, the situation is not that simple. Because the image sensor of digital camera is very single, it is nothing more than CCD or CMOS, that is to say, the signals of each other's image engines are all

Come closer. The post-processing of image data has created different styles of different brands and different series of models, which is the embodiment of the core technologies of various manufacturers, especially in noise reduction.

The degree of technology research and development has a great influence on the resolution.

The higher the ISO, the louder the noise?

Slightly experienced digital camera users sometimes use high sensitivity settings when shooting moving objects or dark environments, and shoot when the ISO value is high.

Shutter speed is relatively fast, which makes it easier to shoot, but one problem brought by high sensitivity is that the noise of the picture will increase, which actually makes many digital camera users quite.

The dilemma of headache is low sensitivity, difficult shooting, less noise, high sensitivity, easy shooting and more noise. Generally speaking, we should take high-sensitivity photos.

Reduce the resolution, but the noise in the photo is not so obvious at this time. Simply analyze this, because a pixel on a reduced image is composed of multiple pixels.

What we get after the merger, in other words, is to turn three noises into one noise, which is not a strict explanation, but it can help us understand this phenomenon.

How many pixels is the best for each camera under the high sensitivity setting? This requires the user's own actual experience. Let's make an analogy. If they are all set under ISO400,

It is possible that a 2-megapixel digital camera has the smallest shooting noise at the resolution of 640×480, while a 5-megapixel digital camera can do it at the resolution of 1024×768.

Get good results.

The higher the number of CCD pixels, the faster the focusing speed can be?

Let's take a look at the early digital cameras, because ordinary digital cameras have to read CCD imaging signals when focusing, and the focusing and response speed used to be the first generation of high pixels.

The camera always hurts. The increase of pixels means that the data amount of CCD signal is also increasing every time, and the subsequent processing such as focusing, metering and LCD display is also going on.

Heavy burden Therefore, we can often see that in the digital camera series based on the same hardware platform, the speed of low-pixel products is often higher than that of high-pixel "big brother".

Lithium battery has high energy density and small size, and is the first choice for digital camera power supply?

First of all, we need to know what is a big power consumer in digital cameras. LCD screen, flash, image sensor and processing engine are all big power consumers, and they are all sudden.

It only needs a large current at the moment of work, and the static current at ordinary times is very small. This determines the power consumption characteristics of digital cameras, and requires the power supply to have the ability of sudden large current supply. from

From this point of view, the battery with low internal resistance is more suitable for digital cameras, which can obviously improve the response speed of digital cameras. From the analysis of the average charging time of the flash, lithium is used.

The battery camera is far ahead, generally only 3 seconds, while the model of Ni-MH battery often exceeds 6 seconds.

But in terms of capacity, lithium batteries have no obvious advantages. In 2005, Ni-MH batteries over 2000mAh came out continuously, but the capacity of lithium batteries in ordinary digital cameras

Often around 1000mAh. Moreover, digital cameras with universal nickel-hydrogen batteries can buy emergency batteries at any time, or use other people's chargers to charge them at any time, which is rarely because

The battery died and there was an embarrassing scene. Using a special charger, the charging time is often as little as 4 hours, catching up with lithium batteries. Ni-MH battery is full of energy, charging and discharging nearly 1000 times.

Its endurance makes it the best cost-effective digital camera battery at present.