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.
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