How To Use A Polarizer
News
2017.06.05
Nearly all digital cameras, including all DSLRs and nearly every mirrorless ever made, show a view recorded through the lens. By definition, DSLRs use an optical viewfinder which makes it the easiest to see subtle changes in the view when using filters such as a polarizer.
A Circular Polarizer, further referred to simply as Polarizer, is a special filter which filters out light with a certain polarization. It is used to diminish the effect for haze and reflection which results in increased saturation when taking photos of nature. When shooting through glass, a polarizer helps see more clearly by reducing surface reflections. Here is an unpolarized shot of the Cotopaxi:
First is to know when to put it on and when not too:
Here is the same scene of the Cotopaxi taken with a Hoya HD Circular Polarizer mounted:
Note how details are more visible on the side of the volcano. There are also more details in the snow-covered area which are highly reflective. The biggest difference in this scene though is a change in color. The sky blue is actually caused by light bouncing in the air between water and dust particules. When the polarizer is in effect, a notable proportion of the blue goes away, making vegetation look greener and more saturated.
Second is how to use a polarizer:
Here is the final shot of the Cotopaxi with the Circular Polarizer rotated to maximize its effect:
One can see here that there are more details throughout the image and that colors appear more natural. Another thing to note is that all images are about the same brightness despite the polarizer cutting down light significantly. In all these cases, the camera has set to Aperture Priority mode with the aperture set to F/6.7. Since these were captured using a 250mm lens, the shutter-speed stayed at 1/250s for all shots. Auto ISO was on though, so the camera took the three shots at ISO 200, 400 and 800, respectively. Without Auto ISO the camera would have changed the shutter-speed, potentially causing some blurring. For those shooting in Manual mode, one must change a parameter manually to compensate for the loss of light.
Finally, it is completely worth investing in a quality polarizer. The effect cannot be replicated by software and a poor polarizer can introduce flare. The Hoya HD series not only transmits more light then competitors, it is also made of hardened glass which protects it from impact. They are also coated with a water and grease repellent layer to make cleaning easier. Currently, the Hoya HD3 is the cream-of-the-crop of polarizers. Just make sure to get the right size!
- Digital Photography
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