What kind of filter does a SLR lens need to shoot the sun?

The dimming filter used by SLR to shoot the sun is mainly to reduce the amount of light entering the camera. The reducing mirror plays a very important role in a good photo. The filtering function of the thinning mirror is non-selective, and the thinning ability of light with different wavelengths is equal and consistent;

In other words, the antireflection mirror will not have any influence on the color of the original object, but also can truly reproduce the contrast of the scene (essentially, due to the process, the color temperature will still produce a small amount of deviation).

Extended data:

The simplest photography does not need a lens, just a pinhole, and its aperture is generally below f/ 128. Early cameras used a single-lens lens, and the imaging could be sharper than pinhole, and the aperture was larger, which could basically be photographed by hand. The working aperture is about f/ 12. Because it was a large negative, the effect was acceptable.

From two lenses to three lenses, the aperture of the lens is larger and the imaging is quite sharp. Cook triplets are the best design known at present. If it is four lenses, the imaging is quite good, such as Zeiss Tessar, which has a four-piece three-group structure and two lenses are glued together to form a group.

The only problem with the four-piece sky-inserted lens is that the aperture can't be made too large, otherwise the image quality will be degraded. For a 35mm camera, the ceiling of the ceiling structure is f/2.8, even if the best optical glass is used at present. If you want a larger aperture, you need more lenses.

References:

Baidu encyclopedia-SLR lens