It's a hardware limitation in the camera. Pentax in it's wisdom decided
to do away with the mechanical aperture sensor. To use an M lens at
anything other than maximum aperture or an A, F or FA lens using manual
aperture set with the aperture ring, you must use stop down metering.
This is accomplished by setting the camera mode to manual. Once that is
done, you can either set the selected aperture then press the AE lock
button, which will set the correct shutter speed, or hold the DOF
preview on and adjust the aperture ring to get the proper exposure.
It's a pain, but it sounds like more of a pain than it actually is.
It's a well known limitation and has been a source of much angst on this
and many other Pentax lists.
[EMAIL PROTECTED] wrote:
> Hello list.
>
> I have a Pentax K10D camera and have M and A Takumars. The difference
> between the two is with A ones I can set the aperture on the camera while
> on the M ones I can set it only on the lens. There's no real problem with
> this since I prefer to set it on the lens :D as I got used to it with my
> Praktica MTL-5 :D
>
> But a few days ago I borrowed a few lens to a friend of mine, who has
> Pentax K100D Super and also his girlfriend has a PK100DS too. None of the
> M lenses really worked on their camera, since the aperture did not close.
> The A lens in A mode and aperture set on the camera closed well but as
> soon they set the aperture on the lens the aperture stayed wide open.
>
> My question is did anyone faced the same problem? I think it's a software
> based limitation on the Pentax K100D Super rather than mechanical. Is
> there any firmware that will support M lenses on PK100DS too, not just on
> PK10D?
>
> Thanks in advance,
> .timber
>
>
>
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difference between Harvard University and the Harvard University football team.
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