Why is a SLR camera called a SLR?

Question 1: What's with the SLR camera? Why is it called SLR? What does SLR mean? Single lens reflex camera.

A single-lens reflex camera is a camera that uses a lens and reflects the view through this lens.

Principle of single lens reflex camera

The so-called "single lens" means that the photographic exposure light path and the framing light path * * * use one lens, unlike the paraxial camera or the double-reflex camera, the framing light path has an independent lens. "Reflection" means that a plane mirror in the camera separates the two light paths: when the mirror falls during framing, it reflects the light of the lens to the pentaprism and then to the framing window; When shooting, lift the mirror quickly, and the light can shine on the photosensitive element CMOS.

Question 2: Why is a SLR camera called "SLR"? What does this mean? Do you have a full name? Single lens luminous camera

1, single shot: shooting the sea through the lens;

2. There is a reflector

Single-lens reflex camera takes pictures from the lens, so one lens has to take pictures. How? It is to add a reflector behind the lens and reach the viewfinder after several reflections. At this time, what we see is the shooting effect, and the changes of focal length and depth of field can be directly seen.

And SLR cameras can change lenses, and different shooting environments can use different lenses ~!

Question 3: How did the name of SLR camera come from? What does SLR mean? Single lens reflex (SLR) is the most popular framing system.

In this system, the unique design of the mirror and prism enables the photographer to directly observe the image passing through the lens from the viewfinder. It can be seen from the structural diagram of a single-lens reflex camera that the light passes through the lens and reaches the reflector, and then refracts to the focusing screen above to form an image. Through the eyepiece and pentaprism, we can see the scenery outside in the observation window. When shooting, press the shutter button, the reflector will pop up, and the shutter curtain in front of the film will be opened at the same time. The light (image) passing through the lens will be projected on the film to make the film sensitive, and then the reflector will immediately return to its original state, and the image can be seen in the viewfinder. This structure of the single-lens reflex camera ensures that it is shot through the lens, so that the image seen in the observation window is always consistent with the image on the film, and its framing range is basically consistent with the actual shooting range, eliminating the parallax phenomenon of the paraxial head-up framing camera. From the perspective of learning photography, it is very conducive to intuitive framing and composition.

Because the whole imaging system of SLR (focusing and shooting) is a lens, there is no parallax, that is, the framing and imaging are the same. (Traditional cameras are mostly paraxial cameras. Secondly, because the imaging system is used as the lens, the coordinated response is faster than that of ordinary cameras, so the SLR camera can better shoot high-speed moving objects (it will not miss the beautiful scenery because of the slow response of the camera). Thirdly, SLR cameras use lens transformation to form different photography systems. For example, you can change wide-angle lenses, lengthen lenses, add color films and choose macro lenses to meet your different needs. You won't miss the beautiful scenery because the camera lens is limited.

Finally, because SLR cameras mostly use pure natural crystal or fluorite polished lenses, the price is much more expensive than ordinary glass and plastic lenses. Some even use ultrasonic motors to adjust the lens, the vibration IS smaller than mechanical ones, and some have their own anti-shake patents (for example, Canon's EF series lenses have IS logo), especially the so-called pure natural fluorite lenses with red lines. A lens is between 30,000 and 50,000 yuan.

DSLR digital camera refers to a single-lens reflex digital camera, that is, digital, single-lens, lens and reflex. Representative models in the market are common in Nikon, Sony, Canon, Pentax, Fuji and so on. This kind of camera is usually big and heavy.

Models that use electronic viewfinder EVF are also classified as SLR, but generally "similar" is added or EVF framing is indicated, such as Olympus C-2 100UZ and Fuji Finepix 6900. In the working system of SLR digital camera, after the light reaches the reflector through the lens, it refracts to the focusing screen above to form an image. Through the eyepiece and pentaprism, we can see the scenery outside in the observation window. In contrast, ordinary digital cameras can only see the captured images through the LCD screen or electronic viewfinder (EVF). Obviously, the directly seen image is more conducive to shooting than the processed image.

A major feature of SLR digital cameras is that they can change lenses of different specifications, which is an inherent advantage of SLR cameras and incomparable to ordinary digital cameras.

In addition, SLR digital cameras are now positioned as high-end products of digital cameras, so the area of photosensitive elements (CCD or CMOS) related to the photographic quality of digital cameras is much larger than that of ordinary digital cameras, which makes the photosensitive area of each pixel of SLR digital cameras much larger than that of ordinary digital cameras, so each pixel can show more detailed brightness and color range, which makes the photographic quality of SLR digital cameras significantly higher than that of ordinary digital cameras.

Simply put, SLR digital cameras are not suitable for any users. First of all, it is one thing to have the necessary professional knowledge. Secondly, to make good use of SLR digital cameras, we must match different types of lenses, which is likely to make the cost of lenses higher than the cost of buying digital cameras.

Moreover, when traveling abroad, the weight of camera bag with lens group is much higher than that of ordinary camera, which will become a serious burden in the travel process. In addition, when changing the lens of SLR digital camera, the photosensitive element will be directly exposed to the air, so we must also pay attention to the maintenance of the camera when using it. Therefore, although the shooting quality of SLR digital cameras is higher and the price has dropped a lot now, it is not suitable for everyone ... >>

Question 4: What does a SLR camera mean? When shooting, press the shutter button, the reflector will pop up and the shutter curtain in front of the film will open at the same time. The light (image) passing through the lens will be projected on the film to make the film sensitive, and then the mirror will be restored immediately, and the image can be seen again in the observation window. This structure of the single-lens reflex camera ensures that it is shot through the lens, so that the image seen in the observation window is always consistent with the image on the film, and its framing range is basically consistent with the actual shooting range, eliminating the parallax phenomenon of the paraxial head-up framing camera. From the perspective of learning photography, it is very conducive to intuitive framing and composition. Because the whole imaging system of SLR (focusing and shooting) is a lens, there is no parallax, that is, the framing and imaging are the same. (Traditional cameras are mostly paraxial cameras. Secondly, because the imaging system is used as the lens, the coordinated response is faster than that of ordinary cameras, so the SLR camera can better shoot high-speed moving objects (it will not miss the beautiful scenery because of the slow response of the camera). Thirdly, SLR cameras use lens transformation to form different photography systems. For example, you can change wide-angle lenses, lengthen lenses, add color films and choose macro lenses to meet your different needs. You won't miss the beautiful scenery because the camera lens is limited. Finally, because SLR cameras mostly use pure natural crystal or fluorite polished lenses, the price is much more expensive than ordinary glass and plastic lenses. Some even use ultrasonic motors to adjust the lens, the vibration IS smaller than mechanical ones, and some have their own anti-shake patents (for example, Canon's EF series lenses have IS logo), especially the so-called pure natural fluorite lenses with red lines. A lens is between 30,000 and 50,000 yuan. DSLR digital camera refers to a single-lens reflex digital camera, that is, digital, single-lens, lens and reflex. Representative models in the market are common in Nikon, Sony, Canon, Pentax, Fuji and so on. This kind of camera is usually big and heavy. Models that use electronic viewfinder EVF are also classified as SLR, but generally "similar" is added or EVF framing is indicated, such as Olympus C-2 100UZ and Fuji Finepix 6900. In the working system of SLR digital camera, after the light reaches the reflector through the lens, it refracts to the focusing screen above to form an image. Through the eyepiece and pentaprism, we can see the scenery outside in the observation window. In contrast, ordinary digital cameras can only see the captured images through the LCD screen or electronic viewfinder (EVF). Obviously, the directly seen image is more conducive to shooting than the processed image. A major feature of SLR digital cameras is that they can change lenses of different specifications, which is an inherent advantage of SLR cameras and incomparable to ordinary digital cameras. CMOS sensor In addition, SLR digital cameras are now positioned as high-end products in digital cameras, so the area of photosensitive elements (CCD or CMOS) related to the photographic quality of digital cameras is much larger than that of ordinary digital cameras, which makes the photosensitive area of each pixel of SLR digital cameras much larger than that of ordinary digital cameras, so each pixel can show more detailed brightness and color range, which makes the photographic quality of SLR digital cameras significantly higher than that of ordinary digital cameras. Simply put, SLR digital cameras are not suitable for any users. First of all, it is one thing to have the necessary professional knowledge. Secondly, to make good use of SLR digital cameras, we must match different types of lenses, which is likely to make the cost of lenses higher than the cost of buying digital cameras. Moreover, when traveling abroad, the weight of camera bag with lens group is much higher than that of ordinary camera, which will become a serious burden in the travel process. In addition, when changing the lens of SLR digital camera, the photosensitive element will be directly exposed to the air, so we must also pay attention to the maintenance of the camera when using it. Therefore, although the shooting quality of SLR digital cameras is higher and the price has dropped a lot now, it is not suitable for all users, and users should choose according to their own needs when purchasing.

Question 5: Why is it called a SLR camera? What is the concept of SLR camera? SLR refers to single-lens reflection, and the unique design of reflector and prism enables photographers to directly observe the image passing through the lens from the viewfinder.

Question 6: What is a SLR camera? The full name of SLR is single lens reflex camera. Unlike paraxial cameras, SLR takes pictures through the lens. It is also different from the double reflex camera, that is, the so-called "single lens", that is, the scene projected onto the photosensitive surface through the lens is the same optical path as that seen by the human eye. "Reflection" refers to the mirror contained in the fuselage, which is responsible for reflecting the scene incident through the lens to the top, and then refracting it through the pentaprism (that is, the top of the SLR camera), so that the photographer can take a view through the eyepiece. For a long time, the most common digital SLR is this camera with a built-in pentaprism viewfinder. In the early days, there were also SLR cameras looking down like double reflex cameras. (Figure 1, 19 The Baijia FX2 camera produced in East Germany in the 1950s is the same as the double-reflex camera. From the appearance, the volume of SLR cameras is usually relatively large, because the structure has to accommodate the lower reflector and pentaprism. The camera can also be equipped with a vertical handle, and the top professional machine is integrated with the handle, so we often see professional photographers holding a big square camera, so it has two shutter buttons, which is convenient for holding the camera and controlling the shutter button when composing vertically. Now digital SLR cameras are very popular, so choosing an entry-level machine is not expensive and cost-effective. But there are also telephoto digital cameras, which are similar in appearance, but poor in function and performance. Don't be misled by its low price when buying. If you want to buy a professional camera with limited funds, it is far more reasonable to buy a second-hand SLR camera than a brand-new "SLR-like" camera.

Question 7: Why is SLR called SLR? Literally, it is "single lens reflex camera", referred to as SLR. English abbreviation SLR. This word was invented in the movie era, so it has nothing to do with numbers. "Single lens" in SLR is relative to double lens. Double-reflex camera, that is, dual-lens reflex camera, has two lenses, one is responsible for framing and the other is responsible for film exposure to complete shooting. A SLR camera has only one lens, which is used for framing and exposing the photoreceptor (whether the nail barrel is film or CCD/CMOS).

Question 8: Why is a SLR camera called a SLR camera? It is impossible for a camera to have a SLR structure!

The full name of SLR is single lens reflex camera. As the name implies, "single lens reflection" refers to the framing structure of the camera. There is a reflector behind the lens and in front of the shutter. Usually the reflector is off, and the light from the lens is reflected to the prism and sent to the viewfinder by the photographer! When the shutter is pressed, the reflector is lifted and the shutter is opened, so that the lens light shines on the film or imaging element for imaging!

This structure is used for cameras, among other things, there is no shutter sound when shooting!

Question 9: What is a SLR camera? SLR camera is a single lens reflex camera. You can change the lens and shoot what you see.

Question 10: Why is a SLR camera called a SLR? What are its characteristics? Literally, it is a "single lens reflex camera", referred to as SLR. English abbreviation SLR. This word was invented in the movie era, so it has nothing to do with numbers. Because the definition does not involve the use of any photosensitive materials, both digital SLR and film SLR in earlier years are SLR. Only later, in order to distinguish, a D was added before the SLR, and DSLR specifically refers to the current digital SLR.

"Single lens" in SLR is relative to double lens.

When the word was invented, double opposition was still very popular.

Double-reflex camera, that is, dual-lens reflex camera, has two lenses, one is responsible for framing and the other is responsible for film exposure to complete shooting.

(Reflective type will be explained later)

SLR cameras have only one lens, which is used to view and expose the photoreceptor (whether film or CCD/CMOS).

How? This is about "reflection".

Let's talk about the "anti" of "double opposition" first.

Double-reflex camera, the upper lens is responsible for framing, and the light passes through the lens and shines on the 45-degree plane glass mirror fixed behind the lens, so the image directly entering the framing lens is turned upwards and projected onto the framing ground glass for photographers to frame and compose, and observe and focus.

The inversion of single-lens reflection is similar to that of double-lens reflection. There is a flat glass mirror with a 45-degree angle behind the only lens, but this mirror is not fixed, but movable. Usually, it exists at an angle of 45 degrees, so that the light entering the lens goes up, passes through the pentaprism (explained in the next article) and reaches the viewfinder. The moment you press the shutter, this little mirror (called mirror) will bounce up and turn over. In this way, the light path is unblocked, so that the light entering the lens can directly shoot into the back of the reflector, and at the same time, the shutter is opened to expose the photoreceptor and make it sensitive. After exposure, the reflective lens will automatically reset and introduce light into the viewfinder.

This is why when we use SLR, the viewfinder will be black at the moment when we press the shutter.

SLR camera and shooting * * * use the same lens, so the reflector must be active, and the light path should be switched when shooting and shooting.

The double reverse is fixed, because both framing and shooting have their own lenses and do not interfere with each other.

But the double mirror is bulky, the lens is the same as the other one, and the lens cost is high. Most importantly, because of the parallax between the two shots, it is more obvious to shoot things at close range, and what you may see is not exactly the same as what you shot.

SLR is almost what you see is what you get (the scope of framing is not discussed here), and the camera is relatively small, but when you flip the mirror up and down, the camera will vibrate, sometimes affecting the imaging. More than 80% of the clicks we heard when shooting were not the sound of the shutter, but actually the sound of the mirror moving.

Another important feature of SLR cameras is that this single lens can be disassembled and replaced.

Finally, let me talk about the pentaprism.

Let's talk about double opposition first.

Double reflection only uses a 45-degree mirror to reflect light onto the viewfinder screen. We know that mirroring is the opposite.

So when we look down with the camera, the image we see on the ground glass is also inverted.

If you move the camera and want the person next to you to move to the middle, what you see on the screen should be the opposite of the actual hand. This makes the operation very inconvenient!

Therefore, a pentaprism is designed on the reflector of SLR camera. Its function is to make the image we see in the viewfinder positive, up and down, left and right, which is consistent with direct vision in all directions.

The SLR camera head is very big, and it is a pentaprism.

Recently, some low-grade SLR have replaced pentaprism with pentaprism, and the effect is the same.

One more thing to clarify is that it is said that SLR imaging is good, but this is not directly related to the word "SLR".

The difference in imaging quality between a lens the size of a coin and a lens the size of a barrel is fundamental.

And the most fundamental thing is the size of negative numbers.

The CCD/CMOS of a small card machine is actually only the size of a fingernail.

The CCD/CMOS commonly used in digital SLR cameras is the size of stamps.

I have just calculated that the CCD area of the most common APS-C (small, non-Quan Huafu) SLR is 9.857 times different from that of the larger11.8-inch card machine (high-end card machine of about 3,000 yuan). About 10 times!

Not to mention the ordinary thousand yuan small card 1/2.3 inch compared to the full-frame machine.

So the main reason for good SLR imaging is that the frame is relatively large and the lens quality is high.

In fact, there are many factors such as advanced processors. ...& gt& gt