Originally posted by nukeglus Thanks for all your advices! I'm looking for some lenses you suggested, and by now i found:
M28 f2,8 at about 50 Euro;
F35-70 f3,5/4,5 at about 80Euro;
FA28-200 f3,2/4,5 at about 100 Euro;
Sigma EX DG 28-70 f2,8 at about 240 Euro;
Pentax A 70-210 f4 at about 56 Euro...
what do you think? Unfortunately here in Italy there isn't a rich used market...
I'm searching for 35-105 but i didn't find it yet...
I've got the M28 f2.8, and I've never been all that impressed with it on my DSLRs - it always seemed a bit soft. Keep in mind that with M series lenses, you'll likely have to do Green Button metering unless Pentax decides to "de-cripple" the mount on the FF camera. It's a bit of a pain. Personally, if I were going with an older prime, I'd try to get something in an A series ( if IQ of different versions are more or less equal ). I don't mind manual focus, but I'm less enthusiastic about the green
button metering. If you've got a flagship body, you can meter using DOF preview, which I prefer to using the green button to set exposure. Bodies that don't feature DOF preview as the 3rd position of the on/off switch ( like my K30 ) lack this useful feature.
I don't think anybody knows which way Pentax will go with that for the new FF. Hopefully, they'll still have metering enabled when doing DOF preview.
I've played around a bit with the Pentax A 70-210 f4. I think I've read that there are different versions, so that may be something to be careful of. The one I tried seemed ok, if be a bit flare prone. Nothing to write home about.
While the A setting allows you to meter directly and control aperture from the camera body, you will have to dial in the focal length whenever you zoom in or out if you want to
use the in-body SR. Personally, I've found that to be a bit tedious whenever I've used an A series zoom. But if you're shooting on a tripod and not changing your focal length much, it might not be a big deal to dial in your Focal Length.
Just a couple of "usability" issues to keep in mind when considering older lenses.