Detailed questions about the unilateral camera!

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, framing and imaging are the same! Traditional machines are mostly paraxial framing! ! Secondly, because the imaging system is used as the lens, the coordinated response is faster than that of ordinary machines, so the SLR camera is more suitable for shooting high-speed moving objects! You won't miss the beautiful scenery because the camera is slow. Thirdly, SLR uses a lens change to form different photography systems. For example, you can change a wide-angle lens, lengthen the lens, add a color film and choose a macro lens. Meet your different needs! You won't miss the beautiful scenery because of the limited lens of the machine! 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 that of mechanical ones, and some have their own anti-shake patents (such as Canon's EF series lenses), especially the so-called pure natural fluorite lenses with red lines, which are between 30,000 and 50,000 yuan. Nikon and Canon are two kinds of machines. Nikon's imaging contrast is large, which is suitable for journalists and microfilms. However, because of his strong professionalism, there are many people in the photography agency, but few people at home know about it. Canon has a high machine penetration rate, many advertisements and many home choices. Canon's professional machine usage rate is much less than Nikon's. Its imaging is delicate and soft, and the contrast is small. The contrast of the film used in the newspaper field is not so great, so journalists still choose Nikon. I am a professional photographer. I prefer Nikon's machine, whether it's a professional machine or a home machine. I recommend: Nikon D60 Nikon D80 Nikon D90 Nikon D5000 Canon 450D.

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