What effect does the lens of SLR camera have on the camera?

The role of SLR camera lens is: both as photography and through it to take pictures. In this way, the problem of photo quality degradation caused by parallax can be fundamentally solved.

Moreover, when taking a view with a SLR camera, the photographed object will appear very clear, which will be reflected by the oblique mirror to the focusing screen for imaging, and then reflected by the "roof prism" raised at the top. Photographers can see the scene through the viewfinder eyepiece, and it is the same image as the scene, which is convenient for framing and focusing.

Extended data:

The lens consists of several groups, about a dozen lenses. Fixed focus is different from zoom and lens focal length, which makes the lens have completely different optical design. The transmittance, curvature and optical path design of the lens largely determine the imaging quality of the lens. However, it should be noted that the quality of the lens is not directly proportional to the number of lenses.

The most representative ones are ultra-low dispersion lens (fluorite) and aspheric lens. Ultra-low astigmatism lens can effectively reduce and weaken the dispersion phenomenon that affects the photo quality.

Aspheric lens needs a special grinding process, and the curved surface of the lens is no longer spherical. Aspheric lens realizes the refractive power of the peripheral part by reducing the curvature of the peripheral part, and ensures that all points with different distances from the optical center have the same focus. This is the principle that aspheric lens can improve the imaging quality.