product name:Polarizer Polarizer CPL
Product synopsis:This product is circularly polarized, mainly used to increase color density, deepen the sky blue, highlight white clouds, and eliminate the reflected light from non-metallic surfaces such as glass or water.
Polarizer Polarizer, also called polarizer, PL for short, is a kind of color filter. The excellent function of the polarizer is that it can selectively let light that vibrates in a certain direction through. It is commonly used in color and black and white photography to eliminate or weaken the strong reflection of non-metallic surfaces, thereby eliminating the light spots. For example, in scenery and landscape photography, it is often used to express the texture of objects in strong reflections, highlight the scenery behind the glass, darken the sky, and express the blue sky and white clouds. A piece of tiny polarizing crystal with orientation effect is sandwiched by two pieces of optical glass(Like mica)composition.
Polarization type:Circular polarization(Circular polarization)
product material:Optical glass
A comprehensive analysis of the principle and use of the polarizer
With some majorsDigital cameraPeople are paying more and more attention to the use of filters. The simplest one is the UV lens. Its function is to filter out ultraviolet rays.(But now everyone uses it to protectLensUp). As for the polarizer, many novices dare not touch it. They always feel that it is too mysterious and difficult to use. In fact, the principle of the polarizer is not complicated, and it is also very simple to use. It is one of the most useful filters. Let me give a more comprehensive introduction to the polarizer below.
1. Principle
In high school, we learned that light is an electromagnetic wave, which is formed by the alternating electric and magnetic fields that are perpendicular to the direction of propagation. This kind of wave whose vibration direction is perpendicular to the propagation direction is called transverse wave. Acoustic waves are propagated by air or other media before and after compression vibration, and its vibration direction is the same as that of propagation. This type of wave is called longitudinal wave.
A characteristic of transverse waves is that their vibrations are polarized. On a plane perpendicular to the direction of propagation, it can vibrate in any direction. We generally regard the vibration direction of the light wave electric field as the light vibration direction. If a beam of light vibrates in the same direction, we call them polarized light, or strictly speaking, fully polarized light. Normal natural light vibrates evenly in all directions and is non-polarized light. However, the glare formed by reflection of a smooth non-metallic surface at a certain angle (called Brewster''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s angle, which is related to the refractive index of a substance) is polarized light. Deviating from this angle, part of the unpolarized light will be mixed in the polarized light. We call this light partially polarized light. Partially polarized light has a degree. The greater the angle of deviation, the less polarized light will eventually become unpolarized light. With polarized light, it sometimes brings disadvantages to our photography. The reflected light on the glass surface prevents us from photographing the things inside the glass showcase, the reflected light from the water surface prevents us from photographing fish in the water, the reflected light from the surface of the leaves makes the leaves white, and so on. The clear blue sky also scatters polarized light in a direction perpendicular to the direction of the sun at 90 degrees, which makes the blue sky less deep. At this time, we need to use a polarizer.
Linear polarizers are generally made of polyvinyl alcohol film processed by iodine dip dyeing, etc., glued between two sheets of flat optical glass. It allows approximately 80% of the linearly polarized light that is in the same direction of its polarization to pass through, and less than 1% of the linearly polarized light that vibrates perpendicular to its polarization direction. Through the polarizer, these polarized light can be basically eliminated, and many photos will appear more saturated in color and clearer.
two How to use polarizer and matters needing attention
The installation of the polarizer is shown in the figure, it can be directly screwed to the UV mirror, if there is a vignetting(This phenomenon is in super wide angleLensThe above is especially obvious, because the lens is relatively behind), You can remove the UV, and then screw on the PL.
The specific adjustment method of the polarizer is as follows: install the polarizer directly onSLRCamera or ordinary DCLensOn the front end, slowly rotating the adjustment ring of the polarizer while passing through the viewfinder(Normal DC must be usedLCDObserve, cannot observe with optical viewfinder)Observe the polarized light source in the subject until it disappears or diminishes to the expected effect. If the camera does not have an adapter ring, cannot install a polarizer, or can only view in a range axis, you can put the polarizer in front of your eyes, rotate the polarizer adjusting ring while viewing the view, until the polarized light disappears or weakens to the expected size, and then Under the premise that the orientation of the adjustment ring remains unchanged (that is, the direction indicated by the mark on the adjustment ring remains unchanged), move the polarizer to the position of the camera.Lensfront end. After that, the camera cannot change the shooting position at will, otherwise the polarization direction of the polarizer will need to be readjusted.
Another thing to note is: when using a polarizer, it is not suitable to use a hood due to the need to rotate the filter(Obvious problem); Should try to put the camera in the shadow to shoot.
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