Originally posted by Ole Wikipedia has this lens as f/2.8 as opposed to model 52B, which is 2.5. The lens is missing from the adaptall.org, so how do we determine what's correct?
Ole
My tamron SP booklet that came with my 24mmF2.5 shows the following
- 90mmF2.5 model 52B with 8/6 elements/groups
- Minimum distance from focus plane 0.39meters giving 1:2 reproduction, with
- focusing throw of 44 degrees 56 minutes from infinity to 1.5 meters and 293 degrees throw from 1.5 meters to 0.39 meters for a total focusing throw of 338 degrees.
- total weight 420g
- length 66mm
- diameter 64.5mm and
- 49mm filter
trust this helps, but perhaps there is another version also