Originally posted by nater Does anyone have any experience with pre-HSM Sigma EX and EX DG lenses on the K-1?
Yes. Usually, they work without problems. I've got two - a 12-24 and a 24-70, both sporting a diaphragm ring (lockable in 'A' position).
You can check yourself - the bayonet ring on the "affected" lenses, that is those with the mechanical problem, ist really huge. Check the image above posted by noelpolar, here you can see the bayonet contacts in relation to the ring's diameter.
Older Sigma lenses used normal-sized bayonet rings (at least the ones I know of), so there's no problem.
The firmware problem (causing camera body lockups) might be related to SDM/HSM lenses only, since the KAF3 protocol clearly is different from the KAF protocol.
From all the Sigma glass I've got only one is problematically, that's the 70-200/2.8 APO EX DG HSM Macro II, and that one's currently being serviced by Sigma.
Last edited by funktionsfrei; 06-26-2016 at 11:35 PM.
Reason: removed double quote