Originally posted by clackers ?
All screwdrive lenses can be manually focused.
Originally posted by EarlVonTapia Putting your body in manual focusing mode retracts the AF screw into the body, which lets you manually focus screwdrive lenses without resistance.
I didn't mean manual focus, I meant using the "catch in focus" feature where you preset a focal point, and when the subject comes into focus, the camera fires.
And I was under the impression you had to have either a manual focus lens or a lens that had a switch on it. I came up with that from the tip article here on the forum, but going back and re-reading it, it doesn't say you can't put the body into manual focus mode on a screwdrive lens, but I inferred it, perhaps erroneously. From the tip at:
Catch-in-Focus Tutorial - Articles and Tips | PentaxForums.com
it says:
If applicable on your camera model, also make sure that the shutter priority for AF.S is set to “Focus priority” (custom menu item #15 or #17 on many cameras, called "AF.S Setting" and enabled by default).
Once this is done, a manual lens needs to be mounted on the camera.
Alternatively, you can use an autofocus lens with an AF/MF switch. The switch should be set to MF.
If your AF lens doesn't have such a switch, the camera can also be tricked into thinking that a manual lens is mounted by depressing the lens lock button or even taping over the electrical contacts, though this is far from recommended!
Users who have set the AF to trigger only via the rear AF button will not be able to use catch-in focus unless they also allow AF via the shutter button.
Read more at: Catch-in-Focus Tutorial - Articles and Tips | PentaxForums.com
So, I took this to mean the lens had to have the switch, and it didn't work by using the switch on the body. I'd happily eat a plate of crow to find out I can throw the switch on the body and use "catch in focus" with all my screwdrive lenses. And it would be good not to loose this feature when converting an SDM with a failed motor to screwdrive.
Hands-on experience from anyone? I know i know, go get the camera and figure it out.....