Jerome Reyes mused: > > Kenneth, > > > Jerome, I have a 600mm FA that uses 43mm filters. > > okay... now I'm confused. Pentax tech support says 49mm. Pentax website > says 43mm... Boz: 43mm... B&H: 49mm.... (d'oh!)
The A lenses take 49mm internal filters; The FA lenses take 43mm filters. I don't know what the F lenses take, but in general I'd believe Boz's site over anything less technical than the real Pentax parts list. I went through all this with Pentax tech support when I lost the filter holder from my A300/2.8, and had to order the parts to replace it. (I chickened out, and had my local camera repair shop do the assembly; there were just too many teeny-weeny screws for me to feel comfortable). The first time they sent me an exploded diagram with the part numbers it was for the wrong lens, and it took me quite some time to convince them that there were at least two different flter holder sizes. I also had to come up with a filter to put in there. Fortunately 49mm is a fairly comon filter size, and I had a skylight filter lying around.
