Why can a SLR camera take a virtual image of a telescope?

Here can only briefly introduce the imaging principle of SLR digital camera:

What is the imaging principle of SLR camera? Digital single lens reflex? DSLR？ (Numbers? SingleLensReflex)？ Camera, digital SLR camera for short. 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? Single lens backlight? .

As can be seen in the structural diagram of the camera, after the light reaches the reflector through the lens, it is refracted to the focusing screen above to form an image. Through the eyepiece and pentaprism, we can see the scenery outside in the observation window. ? The light passes through the lens and is reflected by the reflector to the frosted viewfinder. Through the convex lens and reflected in the pentaprism, the final image appears in the viewfinder. When the shutter is pressed, the mirror moves in the direction indicated by the arrow and is lifted. I'm sorry, the image was taken? On the CCD, it is consistent with what is seen on the viewfinder screen. ?

Advantages of digital SLR cameras:

No parallax? Accurate framing and focusing. This is important for macro and telephoto photography? There are many kinds of interchangeable lenses? Ordinary SLR lenses provide a wider aperture range than fixed lens cameras, especially increasing the maximum light input? Circle? Disadvantages of digital SLR cameras:? Large size? With a small aperture, the viewfinder is very dark? Difference between SLR digital camera and ordinary digital camera

1, with different structures? Is the SLR digital camera completely different from the ordinary consumer digital camera that we contact more? What are the different subjects mentioned here? ,? Now, the internal structures of the two cameras are the same as those of the traditional SLR cameras, adopting special structures, and the digital SLR camera fundamentally solves the image problem? Poor problem, that is, what you see from the viewfinder is an image that will be exposed on film. Because of the ordinary digital camera? CCD？ Photosensitive mode, where is everyone? Liquid crystal? Is this what you read in the newspaper? CCD？ Perceptual image, that is, what the photographer sees on the LCD screen? It is also an image that everyone can shoot, and there is no aberration problem, so ordinary digital cameras can also shoot macro! So from here? Generally speaking, SLR cameras are not dominant.

2. What is the shutter problem? Is an ordinary digital camera enough for ordinary users to take photos of this trip? But for higher requirements, is its shutter speed important? ,? Is extremely important for photographers who adapt to harsh shooting environment? Is it extremely important for ordinary digital cameras to keep the fastest shutter speed? ,? Are you online? 1/ 1000? Seconds or so, and the fastest shutter speed of SLR digital cameras can be easily achieved? 1/ 10000? Seconds or so, so fast shutter? The speed is beyond the reach of ordinary digital cameras, which is very suitable for shooting ecological environment. ?

3. Different lenses? When it comes to SLR digital cameras, many people will relish that it has a variety of lenses to support? Some people think that SLR digital cameras are different from ordinary ones. ,? The biggest difference in using digital cameras is that one lens can be replaced and the other cannot. At first glance, it seems reasonable. Think about it? Actually, it is not. Like what? Olympus? what's up E20P？ This is a SLR digital camera with interchangeable lenses. Of course, most single-camera cameras on the market? Anti-digital cameras are supported by matching lens groups. In shooting activities, we can change different special effects shots by shooting? The viewfinder can view different special effects, and finally choose the appropriate lens Shoot. ? SLR digital camera not only supports many supporting lenses, but also has a higher lens index than ordinary digital cameras. Degree. First of all, for example, the shooting effect of wide-angle end, most ordinary digital cameras have persisted? 35mm~38mm？ Positioning, high-end models? Does the camera support it? 28mm？ Wide-angle, but SLR digital cameras usually shoot a gratifying wide range with original lenses? Angle landscape photos, with a special wide-angle lens, can even continue to expand the visual range. Secondly, digital cameras are very sensitive to jitter? Yes, even a slight shaking will produce blurred photos during exposure. If the ordinary digital camera is not a high-power zoom lens model? In other words, many of them don't have the practical function of image stabilizer, and SLR digital cameras can add lenses to prevent the camera from being unstable when shooting? The occurrence of jitter. ? In addition, the lens part is also closely related to the imaging quality? Comparing the lenses of most ordinary digital cameras and SLR digital cameras, we can see that the lenses of ordinary digital cameras are very small, which is out of proportion to the diameter of the lens barrel. Some models only have the diameter of the lens barrel? 1/3? Left and right, and the lens and lens barrel of SLR digital camera are basically the same, which also causes the optical performance of the two systems? A huge difference in strength. In short, one more lens choice gives you one more guarantee when shooting. A good lens can make the shooting work calm? Finish slowly. ?

? 4. What is the area difference of photosensitive materials? Most digital SLR cameras use full-frame cameras? 2/3? Photosensitive materials, a few high-end products have achieved full width (that is, and? 35? Millimeter? The size of the rice film is the same as that of an ordinary digital camera. ccd？ The area is several times larger, so digital SLR is generally manic. Very small, much worse than the common digital camera mania control, such as? 800w？ what's up Canon? 20D？ And then what? 800w？ what's up Sony? f828？ Than? The difference in manic point control is so great that it can't be compared! ?

? Point:? 1. Shutters of digital SLR cameras and traditional SLR cameras are components with high failure rate, because when shooting, the reflector is the first one. Open it and expose it to the light. This series of actions is very fast, and they are all mechanical devices. Some friends may use SLR? I also noticed that when I pressed the shutter, I only saw a piece of black when I looked out of the viewfinder. You should know from the above explanation, right? Why does the mirror turn up after pressing the door, so that the light can reach through the lens? CCD？ Or? CMOS？ Exposure? The mirror is equivalent to an optical switch. ?

2. SLR cameras are prone to internal dust accumulation when changing lenses, especially digital SLR cameras. What if? CCD？ You usually need it when it's dirty? Take it to the professional maintenance department for cleaning (free during the warranty period, but after the warranty period, it seems like hundreds of sheep at a time, which is expensive)! So in more? Try to find a clean and dust-free place when changing the lens. ?

3. Many users who have just used SLR digital cameras complain that the photos taken by SLR digital cameras are dark, not sharp enough, or even? Not as bright as a pocket digital camera. It's not really the camera. Is this because of the image processing concept of SLR digital camera? Completely different from pocket digital cameras, the image information recorded by SLR is richer and more real for users (more original materials are retained)? Having a wider adjustment range and obtaining more satisfactory pictures also requires users to have a certain level of computer photo processing. Pocket number? Most coders will automatically process pictures, such as color exaggeration and image edge sharpening, and leave them to users for post-processing. Not many. ?