My IR converted K10d has started acting strange - basically it pretty
much ignores any A, F, FA or DFA lens that is attached to it and treats
them like a K or M mount. The camera will do nothing unless "using
aperture ring" is enabled in the custom options. Even then, if the
apeture ring (if present) is set to the "A" setting, the camera will not
stop down the aperture while making an exposure or when the DOF preview
is invoked. The camera does show the aperture and shutter speed setting
on the LCD and allows them to be changed, and shows them changing in
program modes, but it never actually stops down the lens to the shown
aperture. The exif data in images shows the lens wide open in all shots,
even when the LCD shows it stopping down. The camera correctly detects
the maximum aperture of different lenses attached to it.
At first I thought it was a mechanical problem with stopping down the
lens - but if the apeture ring is moved off the A setting, or if a pre-A
K mount lens is attached, then the camera works as it should. In manual
mode it does stop down metering and (in manual mode only) it stops down
the lens and DOF preview works. So the mechanical couplings work, it
seems like the camera is unable to detect a lens in A mode in order to
stop it down, though it does detect the lens's maximum aperture and
shows that the aperture should be set to on the LCD screen
Has anyone experienced something like this? Could this be something
simple, like an issue with contacts in the mount? I like the camera and
have gotten some nice images with it, but have actually taken only about
5000 exposures with it in the 5 years I've owned it, so the utility of
repairing it is questionable.
Any thoughts about what might be going on would be appreciated.
Mark
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