During a discussion in another forum, i discovered that most Pentax QS lenses have a turning focus ring during AF operation.
Like the DA 18-55mm or DA 12-24mm.
In the world of Canon, the QS feature is called FTM (Full Time Manual).
Especially QS screw-drive lenses did catch my interest, to see which lenses have a non turning focus ring during AF operation.
I did get the result, that only QS screwdrive lenses with a distance scale behind a transparent plastic-covered window offer this feature.
These are the eight ones:
- DA 14mm 2.8
- DA* 16-50mm 2.8
- D FA 50mm 2.8 Macro
- DA* 50-135mm 2.8
- DA* 60-250mm 2.8
- D FA 100mm 2.8 Macro
- DA* 200mm
- DA* 300mm
All other screw-drive AF lenses with QS have a turning focus ring during AF operation. No matter if they offer a separate distance scale or not.
So the interesting thing is that the D FA 100mm f2.8 Macro has a non-turning focus ring but the D FA 100mm f2.8 Macro WR has a turning focus ring.
the focus ring doesn't turn during AF operation with most of the 23 SDM/DC/PLM lenses offering QS.
Known Exceptions: DA 20-40mm Limited
Lenses with SDM/DC Autofocus | PentaxForums.com
But which are the ones with turning focus ring and which without?
Last edited by angerdan; 02-27-2021 at 05:04 AM.