The big hard rubber hood that was a very expensive optional extra for the final version of the 17mm Tamron S.P had an internal 82mm filter thread.That Tamron 17mm is a weird one. Actually, it wasn't just one. It came in FOUR versions -- even though they all had the same Toptical design. Two had front filter threads -- 67mm & 82mm -- but two others did not. Two had internal filters, but two did not. The one I have has a 67mm front -- WITHOUT filter threads -- and NO BUILT-IN filters. It is marked "82" for the add-on lens shade -- which allows you to attach filters. I bought mine -- without the "lens/filter shade" and got it for a great price. The front is 67mm, so I attached (glued) a 67-77mm step up ring, and now I can attach filters.
Great lens. I use an Adaptall-2 (version 2) mount.
And it's not easy to unscrew a filter from.
I have a pretty good set of Tamron SP Adaptall lenses. Really like them. I have the 17mm (with hood and built in filters), the 35-80 f2.8 (very sharp and takes great closeups), 70-150 f2.8 Soft (very rare, very sharp with soft focus off to very dreamy with soft focus set high), 2x -- 80-200 f2.8 (with hoods and tripod mounts), and the latest (3d version)(grey) version of the 300 f2.8. All of them, except the 17mm (which has good sharpness), are really sharp. The 80-200 SP is better/sharper with less chromatic aberration than the Vivitar Series 1 70-210 lenses (Versions 1 and 3) that I have, although the Vivitars are lighter and focus closer.
I used to have the Vivitar Series 1 f 2,8 70 -210 mm zoom, which although it was a very. good lens optically, I didn't use very much because it was so heavy. I eventually part exchanged it for the Canon FD 70 - 210 F 3.5 that is much lighter, and has separate focus and zoom controls that I much prefer.
I knew there were different versions of the Vivitar Series 1 70-210mm -- f3.5 vs f2.8-4.0 -- but I didn't know there were eight of them (seven listed here):
https://www.pentaxforums.com/userreviews/vivitar-series-1-70-210-line.html
I rely on a Minolta Rokkor-X 70-210mm f4.0 for normal use, and a Tokina 80-200mm f2.8, for low light.
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