david_carson Posted February 18, 2004 Share Posted February 18, 2004 Does Pentax use the "screwdriver blade" or "driveshaft" method of autofocus, or do they use a version of USM (like Canon)? I've read something of a declutching mechanism... Link to comment Share on other sites More sharing options...
alexandru_sarbu Posted February 18, 2004 Share Posted February 18, 2004 Pentax put the AF motor in the bodies, not lenses; so it's not possible (not until they change that) to have USM. If the body is set on AF, you can't focus manually until you set it on MF; otherwise, you could damage the camera. But with a decluthing mechanism, you have some sort of "full time manual focusing" - just ignore the AF/MF switch and use the aperture ring. Very nice, but - for now - present in only 2 lenses, the 16-45 f/4 and the 14, both DA (designed for *istD). Link to comment Share on other sites More sharing options...
paul_quirk Posted February 19, 2004 Share Posted February 19, 2004 As Alexandru already mentioned, the motor is inside the body. Where the lens and body meet, there is what resembles a flathead screw on the lens where it meets the camera, with the blade part that turns it on the camera. When you look at an AF Pentax lens when it's removed and turn the focus ring, you can see this little "Flat head screw" connector turn. Link to comment Share on other sites More sharing options...
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