Originally posted by 88lukas88 any experience with the older Sigma 70-200/2.8 EX APO ??? thanks
Just received my body today, and after my obligatory 'first shot' using my original M50/1.7, (my very first Pentax lens that came with my MX back in 1976), I tried a few other lenses. I was especially interested in my Sigma twins. I have the original versions, both the 70-200/2.8 and the 100-300/4; as well as the matching EX 1.4x and EX 2.0x converters. I tried all combinations, and am happy to report that they all work well. At first, I thought the 70-200/2.8 didn't work, but then discovered that I need both the lens and the body to be in AF mode, (I had just shot a couple exposures using my A400/5.6 which is MF only, and forgot to flip the switch back to AF).
Note: Sigma says that the 100-300/4 with the 2x converter does not auto-focus, however I never had any problems with my multiple Pentax bodies over the years.
To recap:
Sigma 70-200mm 1:2.8 APO EX
Sigma 100-300mm 1:4 APO EX
Sigma APO Tele Converter 1.4x EX
Sigma APO Tele Converter 2x EX
(all first generations of these lenses)
All combinations auto-focus on my K-1 just fine. The 70-200 is really quick, the 100-300 auto-focuses like on the bodies of old.