I wanted to share with you a couple of photos taken with the Tokina AT-X 35-70/2.8 (62mm filter thread with Pentax-A setting and Ricoh pin) since I don't think I've ever seen this lens discussed here or on other online forums.
This lens is from the manual focus era, so it's quite well built. It's a two-touch zoom, and the focus mechanism is very smooth and has a long throw. The "A" setting makes metering a breeze. Yes, this lens does have the Ricoh "P" pin, but it's of the round type and lightly loaded, and has not given any problems on my K20D. Anyways, I'll post some photos of the lens soon.
First I would like to say that this is a top-notch lens - sharpness, bokeh, and lack of CA all exceeded my expectations for this lens. I sometimes see the term "prime-like" used to describe the best zooms, and I would not hesitate to use that description here. I'm actually holding back my praise for this lens, as I would like to do some more shooting in difficult lighting conditions to be absolutely sure. But I am extremely pleased with what I see so far.
Anyways, here are the photos taken with my K20D.
f2.8
f3.5
The second shot is a bit overexposed (I'd forgotten that I had set an EV adj. on the camera), but I like the "dreamy" result.
Also, for those of you looking at the EXIF info, note that the focal length listed is not the actual focal length - it's just the focal length I had used to set the SR.
I will post back as I get to use this lens more.