Originally posted by GoremanX If you have the lens set to MF and it still tried to auto-focus. there's something wrong on that end.
Originally posted by WMBP I'm not interested in shorting anything out. But I would like to figure out how to use catch in focus, if I'm able. Never used it before.
As far as I can tell none of my Pentax lenses have an AF/MF switch on them. So I've mounted the Sigma 28 f/1.8 EX DC on my K20D. Pulled the barrel sleeve in to the MF position. Put the camera into MF, too, so I could rotate the lens to set the focus distance. Returned the camera to AF.S. Plugged in the remote cable release. I'd set the focus for a distance of 5 ft. Covered the lens hood with my hand and clicked the shutter release. The camera tried to auto-focus, then took a picture. In other words, it didn't work.
I normally have autofocus detached from the shutter button; I use the AF button instead. I relinked autofocus and shutter, as it seems necessary, although the K20D operating manual doesn't say that. Still no go.
What am I doing wrong? Won't work with this lens? Something else?
Will
I think you are mis-understanding CIF (Focus Trap). You should not have to go through all that to use it. The camera see's focus whether you use the shutter release or the AF button. Even in MF, you still get a focus confirmation. The difference is, with the camera in one of the AF modes, the camera will Not fire (AF-S) until it sees the confirmation. With MF, it will fire regardless.
The way to use it is put a MF lens on your camera. OR a lens that can be Made MF (AF/MF switch or similar). Look through the viewfinder at your subject, Hold the shutter release COMPLETELY down, while turning the focus ring (AF-S only). With some lenses you have to do this slowly. When the camera sees the focus confirmation, it should fire the shutter. Going through all the BS of switching the camera back and fourth and using a remote release, is pointless and destroys the entire advantage of Focus Trap.
If your sigma does not disable AF when you move the collar, I agree with GoremanX, Something wrong with the lens.