Tamron SP 17mm f3.5 rectilinear
This lens really is rectilinear and quite a pleasure to use. Adaptall-2.
For some reason it does not have a filter thread, and one is supposed to buy a special hood which has built-in filter thread. Those are hard to find and darn expensive. Here comes the cheapskate's mod: I took the glass out from an old 72mm UV filter, shaved off a bit of the inside of the rim, and it fit perfectly over the lens. Lens collar's outer diameter is around 70mm. The fit is perfect and snug and does not require any glue or retaining screws, and voila, I have myself a 72mm filter ring. Conceivably a 72-77mm step-up ring would work just as well.
Tamron SP 17mm f3.5 rectilinear
This lens really is rectilinear and quite a pleasure to use. Adaptall-2.
For some reason it does not have a filter thread, and one is supposed to buy a special hood which has built-in filter thread. Those are hard to find and darn expensive. Here comes the cheapskate's mod: I took the glass out from an old 72mm UV filter, shaved off a bit of the inside of the rim, and it fit perfectly over the lens. Lens collar's outer diameter is around 70mm. The fit is perfect and snug and does not require any glue or retaining screws, and voila, I have myself a 72mm filter ring. Conceivably a 72-77mm step-up ring would work just as well.