Can I take photos with PL lens?

types and performance of polarizers

linear polarization scales are also called ordinary polarizers, and their English signs are L-L—PL(UnearPolaxizer) or PL-L (Polarizing F, ilter——Linear), PlLineat, PL and POL.

the linear polarizer is gray in appearance, which can let the vibration light waves parallel to its polarization direction pass through, and at the same time, it can weaken the vibration light waves in other directions to varying degrees. Artificial linear polarizers are generally made of polyvinyl alcohol films that have been processed by iodine impregnation and glued between two flat optical glasses. It can pass about 8% of linearly polarized light in the same polarization direction, and less than 1% of linearly polarized light vibrating perpendicular to its polarization direction. In order to install on the front and back sides of the subject to capture photoelastic effect, or to install in front of the lighting source to eliminate the reflection on the surface of metal objects, some filter manufacturers (such as Kenco and B-W) produce polarizing plates with larger sizes. Such as a 3×4cm polarize plate supplied by Kenco company in Japan.

Polarizers are obviously different from ordinary color filters in black-and-white photography. Generally, a polarizer does not change the contrast between different unpolarized colors in the photographed scene and the contrast between black and white tones when it is converted into achromatic colors, that is, it treats all unpolarized colors equally. The color filter can obviously change the contrast between light and dark and the contrast between black and white in the picture between different colors in the scene through its different light transmission and light blocking (that is, transmission and absorption) characteristics.

Polarizers are also obviously different from color temperature-adjusting filters and color compensation filters used in color photography. The polarizer does not change the color temperature of the light source, and generally does not affect the total tone of the image formed by various unpolarized colors in the scene.

in order to eliminate or weaken the polarized light reflected from the photographed scene, the adjusting ring of the linear polarizer should be properly rotated so that the polarization direction and the vibration direction of the polarized light are perpendicular or oblique to each other. The closer the intersection angle between them is to zero, the smaller the degree of polarization weakening, and the closer the intersection angle between them is to 9 degrees. The great that attenuation of polarized light.

The specific adjustment method is as follows: directly install the polarizer at the front end of the camera lens of a single-lens viewfinder or video camera, and slowly rotate the adjusting ring of the polarizer while observing the polarized light source in the photographed scene through the focusing screen until it disappears or weakens to the expected effect; Put the polarizer in front of your eyes, and rotate the adjusting ring of the polarizer while taking a view until the polarized light disappears or weakens to the expected size. Then, under the premise that the orientation of the adjusting ring remains unchanged (that is, the direction indicated by the mark on the adjusting ring remains unchanged), translate the polarizer to the front end of the photographic lens of the paraxial camera. After that, the camera should not change the shooting orientation at will, otherwise the polarization direction of the polarizer needs to be readjusted.

in order to adjust the polarization direction of the polarizer, some manufacturers specially install a small handle on the polarizer, and the handle direction is the polarization direction of the polarizer. Some manufacturers also carve a score line on the polarizer ring, and the diameter line passing through the score line is the polarization direction of the polarizer.

In order to make it easier for cinematographers to take pictures outdoors with B-type color film, some manufacturers produce compound polarizers. For example, Tiffany's 85BPOl and 85POI‘' filters are composed of 85B and 85 warm color temperature filters and polarizer POL respectively. Another example is Japan's Baogu brand warm-tone polarizer (85 POL) and Japan's Kenke brand red polarizer (PR-6). German brand B 1 W warm polarizing mirror (WarmTonePolarizer).