What are the functions of various filters in digital cameras?
What are the functions of various filters in digital cameras? Red mirror (right):
Absorbing blue light can produce romantic sky effect or moonlit effect when shooting during the day, and it has the function of absorbing ultraviolet rays. When shooting, it is generally necessary to add three levels of exposure, which can be mastered flexibly according to shooting requirements and filter depth. This kind of mirror is generally used for black-and-white photos and can also be used for color photography. The filter functions of other colors are basically similar.
UV (ultraviolet) mirror:
The mirror can basically eliminate the influence of ultraviolet light and stray light on film sensitivity and protect the lens at the same time. Photography is more needed in plateau areas.
Blue mirror (b):
Used for black and white photography. Mirrors absorb red, orange and yellow through cyan, blue and purple light. When the wavelength is about 400-500nm, it is necessary to increase the exposure by about 2 levels (depending on the depth of the color lens).
Mirror of the sky:
Sky mirror is extremely light magenta, which can not only absorb ultraviolet light, but also absorb part of blue light and green light, so it has a certain effect on the color balance of the final picture.
Polarizer (polarizer):
PL mirror for short, this kind of filter can effectively weaken or eliminate the reflection of non-metallic surface. Polarizers can be used for black-and-white and color photography. Adding a polarizer to color photography can darken the sky while still maintaining other original colors of the scene.
Gradient mirror:
Gradient mirror is one of the most important filters in photographic art creation. It can be divided into gradient mirror and gradient diffusion mirror, and can be divided into soft gradient and hard gradient in gradient form. "Soft" means a large transition range, and vice versa, it means a small transition range, which should be chosen according to the creative characteristics.
Atomizing mirror:
This kind of mirror is a common filter for natural scenery photography, and it is also widely used in advertising photography and portrait shooting. It can make the work have a foggy effect and increase the sense of atmospheric perspective.
Mirror:
The mirror is a rectangular reflector with positive reflection (mirror vacuum silver plating) and a pair of coaxial knobs at both ends (for adjusting the lens angle).