Hi Nogbad,
Filters,for what it's worth.
a) UV= Protection for your front lens element in hostile environs ie saltwater spray, desert sand/dust, rain etc.
b) Polars= Bright blue enhanced skies with clouds; or reduction/increase in reflections; special effects with plastic.
c)ND=A need to cut down light for a particular exposure, ie solar eclipse, images of the sun where the light intensity is huge.These are smoke coloured and vary in density from a pale grey to almost black.I have one somewhere which is almost black, and was used, back in the "old days" for multi-exposures of the sun rising and setting on one piece of film.
If you need polars ,then Cokin (large) with various filter thread adaptors might be a cheaper option?The rest of the filters are not much use unless you are seriously into BLACK&WHITE, ie the reds/greens/yellows etc.The special effects filters are perhaps useful, ie star bursts,multifacets,centre spots etc but remember you can only get away with these effects for so long before they become boring (yawn).
If you can afford/only have one filter, then go for a protection one as it will earn its keep over and over again.
regards Subzero.
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