I currently own a 17-85mm f/4-5.6 EF-S lens and a 70-200mm f/4 L USM lens. The filter sizes for both of these lenses is 67mm. I have had both for about a year now and have a UV filter for each and one ND filter. I will soon be purchasing the 10-22mm f/3.5-4 lens, with a filter size of 77mm, and a 50mm f/1.4 lens, with a filter size of 58mm. I have quite a few questions, as I'm really just a beginner to the wonderful world of filters. For my 10-22mm lens, I want to buy a Circular Polarizing filter, a ND filter, and a Grad ND filter. Also, perhaps a UV filter for protection. First off, I'm planning to use the 10-22mm primarily for landscape shots (duh,) which is why I'm interested in getting the filters listed above. But, I know there are distortions that can occur when using a polarizing filter on a very wide lens-so, is this something I should avoid all together or just take into consideration when shooting? For my canon 50mm, the only filter I can think of buying now is an UV filter, again for protection. However, I can see the number of filters adding up in my bag... with the cost also going up. So, would you recommend me to get a step up ring for my 67mm and 58mm's? Also, if I buy a step up ring, is it universal for all smaller sized filters or are they specialized; i.e. one for 67mm-77mm, another for 58mm-77mm. I know the step up rings don't allow for the use of a lens hood, which I am pretty used to. Or, should I just take the plunge and buy filters for each lens? Thanks for any feedback One last thing- I know I am treading into subjective material when discussing "to UV or not to UV," but I'm really stuck on this topic and would love some advice. I know many photographers just use the hoods for protection, but I wonder, how would that protect against any debris actually making contact with the lens itself? Thanks for any responses!