Thanks for the info. I suppose the best way to check for sure is to take some with and w/o pics then compare the results. I would think any noticable effect would be subtle with these particular filters. If I ever invest in a lens with high quality glass then it makes sense to use high quality filters to go with that lens. As for the Minolta slr lenses I have now...two kit lens (one quantary, one Minolta)and one Minolta 100-300 mm zoom that was around 200 bucks...I'm not sure. I read a magazing article about lenses that said unless you are a really experienced photographer you probably won't notice much difference between high end glass and cheaper glass in todays modern lenses.