> You have to remember that there are two types of manual focus
> lenses. The "A" and the "M" versions. The "A" version has all the
> proper electrical contacts to allow the camera body to control the
> aperature, and has an "A" position on the aperature ring just
> beyond the min f-stop mark. The "M" version does not, and the
> aperature must be set via the lens itself.
Well, technically, assuming that you're talking about the K-mount MF
lenses, there are also the SMC ("K") lenses, but they also lack
electrical contacts, and work just as the M lenses do, as described.
Fred
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