I can tell you straight - that is NOT the way you use a CPL filter. The CPL is meant to do what its meant to do, not to protect your lens from dust or damage. As Mark said, you will loose 1-2 stops of light and that's not good for your lens or just every lens depending on what you're doing. Take off the UV filter and put the CPL on when you need it, then switch back again.
Ditto Ben's advice. Your CPL will kill you in any low light situation. I forgot mine was on one night at a high school football game and spent 10 minutes trying to figure out what was wrong with my camera.
Thank you for all the info. I have further questions:
Can I stack the CPL in front of the UV filter? Will it affect the output if I can do so?
I am trying to find a way to not take off the UV filter when shooting outdoor to avoid exposing my lens to dust.
Under most conditions, you don't want to stack the filters.
If you are working in harsh environments, such as salt spray from an ocean mist, then leave it on.
You should not. You'll most likely end up seeing color desaturation caused by flares and other light artifacts on your image. That happens when the light enters and bounces back and forth between the multiple layers of your filters' reflective surfaces.
Originally Posted by csphua
Yes, physically you can as long as you are not using the super slim UV filters which does not have a screw on the outer side. And YES, that will affect your output. You will likely see vignette on your lens when shooting at 18mm or around wide angle range. Flare will likely to exist when shooting in bright sunlight (i guess that's when you use the CPL the most right?) especially when the sun is in front of you or is part of your image. Sharpness and contrast can be reduced too, depending on what kind of UV and CPL you're using. Try to get multi-coated filters, that makes a noticeable difference. But DO NOT stack filters.
Dust is not avoidable in reali life shooting. As long as there isn't extremely too much dust, you IMAGE WILL NOT BE AFFECTED. Some dust involved when changing filter is not a problem for me, and it does not harmful your lens in any degree - blow them off afterwards if you need to, I'm too lazy to do that as long as I don't see them on my pictures. I know some people they like to keep their eqipment completely clean as just out of the box, i respect that too.
Yes, physically you can as long as you are not using the super slim UV filters which does not have a screw on the outer side. And YES, that will affect your output. You will likely see vignette on your lens when shooting at 18mm or around wide angle range. Flare will likely to exist when shooting in bright sunlight (i guess that's when you use the CPL the most right?) especially when the sun is in front of you or is part of your image. Sharpness and contrast can be reduced too, depending on what kind of UV and CPL you're using. Try to get multi-coated filters, that makes a noticeable difference. But DO NOT stack filters.
Dust is not avoidable in reali life shooting. As long as there isn't extremely too much dust, you IMAGE WILL NOT BE AFFECTED. Some dust involved when changing filter is not a problem for me, and it does not harmful your lens in any degree - blow them off afterwards if you need to, I'm too lazy to do that as long as I don't see them on my pictures. I know some people they like to keep their eqipment completely clean as just out of the box, i respect that too.
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