Any filter you put in the optical path will degrade the image, the question is will the filter improve certain aspects of the photo to make it stronger. I use Photoshop to post process the images for things like warming and cooling or giving or removing a cast. The CP can not be Photoshopped in, so can be very usefull with foliage, clouds, skies, and anyplace you need to remove specular reflections. And as mentioned, a UV can be used to protect the front element, a lens caps is more rugged.
Bob
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