How to choose Canon 40D camera and lens EF 16-35 F2.8L II USM?

Choose Canon40D fuselage and measure it with DeadPixelTest software. Methods:/products/camera/EOS/Fujian/40d/bzpj.html.

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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 do it, 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; Please pay special attention to the battery pins.

There are no scratches in the place;

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 want to buy, you can try it out.

Shoot in automatic mode. In addition, the flash has to be tried;

6. Then take a closer look at the LCD and EVF. You can block the lens a little with your hand, so that you can see a more pure color image, or

Facing the black and white.

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 point of CCD directly on DC, it is necessary

Import the picture into the computer and watch it again. If there is no computer in the business, it is recommended to talk with the business about a certain replacement cycle, and then go home and feel at ease to test;

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.

A point is always open. Usually always at the top, rarely not. So why is there a bad point? this

This is related to the manufacture of CCD. Although the technology is very developed now, it still can't guarantee the high output of CCD. just as

Like LCD, there may be defects. 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 a comparison

Intuitive, but be careful, otherwise it is easy to miss points. 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

For the camera, we just need to cover the camera. If there is no lens cover like Casio, then we can put a thick one on the flat.

Aim at the paper, put down the DC lens, and shoot the lens on the paper. It should be noted that light must not enter the lens, and at the same time, it should not.

Excessive force can 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. namely

Take a picture with different shutter speeds.

After shooting, we can import the photos into the computer and open DEADPIXEL for testing. After opening this software, we can

See the interface below. We click the "Browse" button and select the photos that need to be tested. Then we press the test button, and as a result,

It will appear. If the photo of 1/60 is more noisy than 10, try to change it, otherwise it may affect the shooting.

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

Count.

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 well, then

It may affect our normal shooting. Usually we may need to buy three memory cards, batteries and chargers, UV and adapter rings, and camera bags.

Base, etc. Some people like to buy all digital cameras at once. I think if you buy these at the place where DC is sold, the price will definitely not be.

It will be cheaper. Except for the memory card, everything else should be bought in a special photographic equipment store, which is not only reliable in quality, but also cheaper in 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. that

Second, you need to consider the brand of the card. 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. take for example

Kingstone)CF card and Toshiba SD card are not very fast, but the quality is absolutely first-class.

, compatibility is also good. Third, consider the speed of the card. There are two kinds of cards sold now: normal speed and high speed. If you need to shoot.

RAW or even TIFF format photos, and then try to buy high-speed cards.

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. Used for charging

My suggestion is to buy lithium batteries in regular stores. On the one hand, there is quality assurance, on the other hand, there is a high probability of buying fake goods. nickel

In terms of hydrogen battery, GP mobile Altman battery is not very expensive at present, and its quality is first-class. Of course, domestic products are not bad. Let's try to buy something with a larger capacity.

Like 2000mAh. For chargers, many digital cameras are given away at random now, so I won't introduce them in detail here.

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 to look at is the purpose.

What machine is it? If the machine is small, it is better not to consider it. Because usually UV can be installed in the machine through adapter ring or adapter tube.

In fact, this increases the size of the camera. If the machine itself is relatively large, such as Canon EOS350D, this is more suitable. ultraviolet ray

There are many brands, so it is recommended to consider multi-layer coating. When buying UV, you should also consider the caliber of UV. If you are not familiar with this,

Then you can buy it with a camera. In addition, after installing UV, the original lens cover may not be covered. We need another one.

A.

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 bigger it is.

The better, but the best. 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. Besides, pay attention to your weight if you are strong and healthy.

Good needs exercise, then this may not be a problem. Weifeng brand is the most popular brand in the market. This brand of tripod is cheaper.

Everything is fine. Admiralty, an imported brand from Japan, 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 number on the box, warranty card and fuselage should be

Is the same; Canon's triple warranty card has a laser anti-counterfeiting label in the upper right corner, 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; line

The outer packing of the goods is in Chinese; Licensed goods have a simplified manual; In terms of warranty card, Fuji licensed products provide a simplified version of Fuji China warranty card.

, there are triple.

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

4. Nikon: Because Nikon has no company in China, several agents are responsible for the sales. They are Quantum, Lida, Liangchi and Innovation.

Kang Hua. Each agent's licensed goods identification method is not exactly the same, but there are still some ways to identify them. We need to see the warranty card first. OK.

The warranty card of the goods is in English with the agent's seal on it. Licensed goods are described in simplified Chinese. Some agents, such as quantum, have defenses on the box.

Pseudo label.

5. Olympus: All machines in Olympus now use simplified Chinese menus, but there are still few products with English menus; Secondly, explain

Books and warranty cards are also in simplified Chinese; 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; Simplified theory of ownership

Shu Ming. Sony DC or DV sold in China market are only made in China, and all imported products are parallel imports. You can see it on the bar code of the outer package.

To CN 1, if it is CN5, it is parallel.

"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 fuselage number, which takes only a few seconds.

Know whether the DC or DV you bought has a 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, and not all Panasonic products have warranty in China. Now in China

Most maintenance departments are contracted, and if there is no formal warranty, the maintenance cost is staggering.

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 key to judge the quality of digital cameras.

It seems that a high-pixel digital camera is bound to get high-quality shooting results. In fact, the relationship between pixels and quality is far from direct ratio.

It's too 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 imaging quality will be directly affected.

The main factor is the lens. Whether it is an optical camera or a digital camera, the lens is one of the most important factors. Use of ordinary digital cameras

CCD is sensitive to light, and its area is much smaller than that of traditional film, so the resolution of lens is more strict, otherwise it will be very small.

With more pixels, the imaging quality will still be poor because of the lens. In other words, this is the resolution of the optical lens used in digital cameras.

Force must be better than the resolution of CCD, so it is much more important to choose a digital camera with high quality lens than simply looking at pixels.

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

Noise is the enemy of the imaging quality of digital cameras. Generally, users will think that a clean picture with low noise always means high resolution of photos.

Effect, in fact, for digital cameras, the situation is not so simple. Because the image sensor of digital camera is very single, it is nothing more than

CCD or CMOS, that is to say, the image engine signals of each other are close. But the post-processing of image data has created different brands.

This is the embodiment of the core technology of various manufacturers, especially in the research and development of noise reduction technology.

Low impact and high impact.

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.

When the ISO value is high, the shutter speed is faster and it is easier to shoot, but one problem brought by high sensitivity is the picture.

Noise will increase, which is actually a headache for many digital camera users, with low sensitivity, difficulty in shooting, less noise and feeling.

High brightness, easy shooting and much noise. Generally speaking, we have to reduce the resolution to appreciate the photos taken with high sensitivity, and this

When the noise in the photo is not so obvious, it is simply analyzed that one pixel in the reduced image is formed by merging multiple pixels.

In other words, three noises become 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, which requires the user's own actual experience. Let's make an analogy, for example

The result is that under the setting of ISO400, it is possible that the shooting noise of a 2-megapixel digital camera is the smallest under the setting of 640×480 resolution, while the shooting noise is 5 million.

A digital camera with pixels can achieve good results under the resolution setting of 1024×768.

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 has been very poor.

Classics are the eternal pain in the hearts of the first generation of high-pixel digital cameras. The increase of pixels means that the data amount of CCD signal is also increasing every time.

Focus, metering, liquid crystal display and other subsequent processing. Also bears a heavy burden. Therefore, we can often see the.

In the digital camera series of the 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?

We must first understand what is a big power consumer in digital cameras. LCD screen, flash, image sensor and processing engine are all big power consumers.

And basically all belong to the burst type, but it needs a large current at the moment of work, and the static current is very small at ordinary times. This determines the digital camera.

The power consumption characteristics require the power supply to have the ability of sudden large current supply. From this point of view, batteries with low internal resistance are more suitable for digital cameras.

The response speed of the digital camera can be obviously improved. From the analysis of the average charging time of flash, cameras using lithium batteries are far ahead, usually only

It takes 3 seconds, while the models using Ni-MH batteries are often longer than 6 seconds.

But in terms of capacity, lithium batteries have no obvious advantages. In 2005, Ni-MH batteries above 2000mAh came out continuously, and universal.

The capacity of lithium batteries in digital cameras is often around 1000mAh. Moreover, digital cameras with universal nickel-hydrogen batteries can be bought at any time in case of emergency.

Our batteries, or charging them with other people's chargers at any time, rarely appear embarrassing scenes because the batteries are exhausted. Using a special charger, its charging time

Often as little as 4 hours, catching up with lithium batteries. Ni-MH battery is the most cost-effective battery because of its abundant energy and charge-discharge life of nearly 1000.

Okay, digital camera batteries. There must be no fewer test steps.

After confirming that there is nothing wrong with the camera's appearance, we will install a battery and a memory card (the latest products are all built into the camera, so the memory card is not provided in the attachment) and power it on for trial use.

Usually, the first step after booting is to test the LCD screen. First of all, we should correct a misconception of many consumers here. The bad points and bright points of LCD display are different from those of CCD. What we can usually visually observe are the bad points and bright points of LCD. The easiest way is to cover the lens with your hand or paper, and then carefully observe every pixel of the screen. If no blue or red bright spots are found, there is no problem. If so, changing the plane is not negotiable. As for how to check the bad spots and bright spots of CCD, we will introduce them in the last part of this article.

The second step is to test the zoom. At present, there are many ways of optical zoom for digital cameras due to the sudden decrease in size, especially the periscope type like Sony T series, which is particularly popular recently, but it is all the same. Consumers can stretch the lens many times, one is to listen to the sound when the lens is in focus, and the other is to see if the display changes smoothly during the whole process. If there is no problem, the test passes.

Step 3, test the shutter and exposure. Because consumer digital cameras basically use electronic shutters, it is relatively simple to test. First, you can set the mode file of the camera to AUTO or P, then pull the lens to the maximum wide angle and take 2-3 shots. When playing, you can see the effect on the display screen. If there is nothing wrong with the light and the flash doesn't turn on automatically, the picture you see should be basically the same as what your eyes see. If you turn on the flash automatically at this time, the picture you see will be slightly overexposed, but these are all things.

The fourth test is focusing. This test is necessary in digital SLR, and it is also necessary to test ordinary consumer digital cameras. You can choose people or still life, but when you can't reach the nearest focus distance, that is, the pattern of a small flower, you should pay attention to setting the camera to the macro position, otherwise the focus will be difficult to succeed.

Step 5, test the flash. General machines are basically equipped with five modes: automatic flashing, automatic flashing with red-eye reduction function, forced flashing, no flashing and slow flashing. Try to test each mode if time permits.

This is the end of the camera test. If you are going to buy a memory card at the same time as the camera, I suggest you put the memory card into the machine for formatting, and then take two photos to test it, because some machines in the market are more "selective" about cards, which is the compatibility problem, and it is easy to replace even if there is a problem.

Check the invoice of the attachment.

So far, two-thirds of the whole purchase process has been completed, and the rest can be said to be the end. After asking the salesman to help you pack your camera, you should start counting some random accessories. In general, there will be a list at the end of the manual. Among them, the key ones are instruction manual, quick operation manual, data cable, charger (some products are directly charged on the camera, so only transformers and cables are provided), driving CD, lithium battery (Sony W series uses AA battery, but a charging kit will be given at random.

Remember to compare the serial numbers of the packaging box, warranty card and fuselage. Under normal circumstances, among the accessories, the battery is tampered with most by dealers. In the early days, the original lithium battery was replaced with a fake one, or the battery set was buckled. However, with the standardization of the market, regular dealers generally dare not joke about their reputation, so they rarely see such tricks recently.

For invoices, many consumers think that they can be opened or not. After all, adding three tax points is not that simple. After all, as a novice to buy a machine, it is inevitable to be cheated. Once filled with water, the invoice is the only written evidence (receipts sometimes have no such legal effect). In addition, as major manufacturers begin to standardize after-sales service, the invoice represents the date when the warranty of your digital camera begins. Sometimes you can't guarantee it without an invoice. Sony is very strict about this. For example, Nikon has few maintenance points in China, so there is no invoice, and sometimes it can't enjoy after-sales service.

Of course, some student consumers will choose not to invoice without exception because they don't have much money in their pockets. In addition to the machine, you need to be equipped with memory cards, bags, tripods, etc. For these special consumers, my suggestion is: choose a large-scale dealer, so that you can contact in time in case of machine problems in the future.

CCD bad spot detection is not necessary.

Many friends who ask me to buy a camera will almost say to me, "Can you help me detect the bad point of CCD? If so, will they change it for me? " I don't think it's necessary for new consumers to care so much about the bad points of CCD, because from my personal experience, there are at least more than 400 machines since I entered the business, and only two have the problem of CCD bad points, and they are all the same brand and model. Later, it was confirmed that the same batch of machines had such problems. It can be seen that the emergence of this problem is very accidental. Even if it appears, the dealer will 100% replace it for you.

Let me briefly introduce the detection method. We use deadpixel's special software. Set the machine to manual position, cover the lens cover, adjust the aperture to the maximum, and set the shutter to 1/30s and 1s respectively to take two black photos, and import this special software. At this time, click Test, and the software will display a list of data. What is hot is noise, and what is dead is.