Hi! For some time I've been using el cheapo (Cokin plastic et al) protective filters on my lenses. Some time ago I stopped doing so. Then recently I found that some of my lenses are now dusty inside. Then on eekBay I found that there are Pentax made lens filters. Some of them are even SMC.
Are they worth it? How do they compare to other manufacturer's filters? Finally, but please don't let it be a flame, if not Pentax, what are the protective filters that match optical quality of lenses such as FA 50/1.7 or M 50/1.4 that I have? Then of course as usualy I may be nuts again... I mean may be filters have nothing to do with dust inside lenses... Thanks. -- Boris
