Polarizing filters help reduce window reflections.
Polarizing filters are placed on the front of your camera's lens for a number of reasons. First and foremost, these filters help limit the amount of polarized light that passes through the lens and reaches the film or sensor screen. When used in landscape photography on a bright, sunny day, this has the effect of darkening a blue sky and saturating the colors of foliage. The filters are also used when shooting through window displays, as they help combat excessive glare. Circular polarizers allow you to rotate the filter to achieve the desired results.
Instructions
1. Check that the filters are the appropriate size for your lens. The number on the outer edge of the filter should correspond with the number on your lens's nameplate. Look for both numbers to be followed by a small circle with a diagonal slash through it.
2. Screw the polarizing filter onto the front of your lens. Most lenses can only support one filter, so your second PL-Cir filter will function as a backup. It can also be placed on a second camera if you desire.
3. Look through the camera's viewfinder and compose your shot. You will notice that the scene or subject appears noticeably darker.
4. Compensate your exposure by decreasing your shutter speed or widening your aperture (lens opening). For most filters, 1.5 stops of exposure compensation is required. For example, if your shutter speed is 1/180, you'll need to drop down to 1/60 for proper exposure. If your camera is set to auto mode or any other shooting mode that meters light automatically, this step is not necessary.
5. Rotate the end of the filter until you achieve your desired results. As you rotate the filter, you'll notice reflections fading or the sky becoming more saturated.
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