Here's something of which I've had no experience on. I've done some research and have a fair idea of how filters work (CPL, ND8 etc). I also know that lenses range in different sizes (how convenient).
I have an 18-55 for my D50 which I will keep, planning on getting a filter for it but then I thought about getting an 18-200 VR later on which is different in size (77mm vs 52mm).
Now I'm still not sure if the 18-200 is better than the 18-55 within the same range (18-55) as some reviews quoted the 18-55 to be sharper, but I think I might appreciate the greater range the 18-200 has. I don't really want to lose sharpness for convenience but if anyone can advice on this then please do. Maybe I don't really need an 18-200 and can forget this step up ring altogether.
Well to my question, will having a step up ring + filter cause more problems than with just a filter? I read that the thicker the filters the greater the vignetting. Not sure how thick is too thick but yeah that is my query really.
Also, how do you stack filters on top of each other?