In addition to the fuselage and lens, filter is also an important part of photography. Although the effect of some filters has been replaced by post-system software after entering the digital era, there are still filters that can not be replaced by post-system software. Some can make the sky bluer, others can improve too much contrast, understand the functions of different filters, and play their role, so that we can make better works.
First of all, the polarizing mirror is a polarizing foil film with strip lattice structure, which is invisible to the naked eye. It only allows light passing parallel to the lattice structure of the polarizing foil film in the traveling direction. Vertical light is completely blocked, while light from other angles is partially blocked.
Polarizer can eliminate the reflection of glass, water surface, or stray light in the sky, to enhance color saturation, so that the blue sky is bluer, green leaves are greener, more saturated and bright than the color seen by the eyes. Although the color of the picture can be changed through the processing of the post-processing software, the software can not replace the function of eliminating the reflection of water surface or glass, so the use rate of polarizer is higher than that of protective mirror.
_Polarizers look like dark glasses in appearance, dark grey.
_It actually has two layers of structure. The yellow part in the demonstration picture is used to lock your lens, while the upper layer can rotate freely.
Here we demonstrate the use of polarizers to eliminate (or mitigate) reflections on glass.
_No polarizer is used, there is obvious reflection on the glass.
_When the polarizer is mounted and rotated to an appropriate angle, the degree of reflection decreases.
Here's an example of using polarizers to make the blue sky bluer
_No polarizer is used.
_The effect of using a polarizer and rotating the polarizer at a certain angle.
The process of using polarizers
_Remove the original protective mirror from the lens.
_Rotate the polarizer to the front of the lens.
_When in use, the eye observes the effect of the polarizer from the viewing window, and rotates the polarizer by hand, then transfers to the angle which appears to be the best effect in the viewing window.
Q: What's the difference between a PL mirror and a polarizer? Herman: PL is actually an abbreviation for the English name of a polarizer, which refers to the same thing.
Q: What's the difference between a linear polarizer and a ring polarizer? Herman: According to its structure, a polarizer can distinguish a linear polarizer from a ring polarizer. Linear polarizers are suitable for old camera systems and have faded out. At present, SLR and DSLR, because of the structure of photometric system, must use circular polarizer, in order to not affect the function of photometry and focusing.
Q: What is an ultra-thin polarizer? Herman: Compared with ordinary filters, polarizers are made up of lenses, frames and rotating rings. When the device is mounted on the ultra wide angle lens, it will cover four corners of the screen to form an obscure angle because of the thickness. The solution is to have the so-called "ultra-thin polarizer" product, which is thinner than the ordinary polarizer, but the protective mirror should be removed when it is used.
Q: With a polarizer, is the sky blue or not? Herman: Polarizers can make the blue sky bluer, but if the sky is foggy, they are useless.
Q: Some people say that polarizers can be used as dimmers. Is that true? Herman: Because the polarizer reduces some light to the camera to some extent, the difference between the polarizer and the non-polarizer is about 1.3EV. It can also be used as a dimmer in emergencies.
_Polarizer can reduce some light to the inside of the camera to some extent.