From: Cory Papenfuss
>Actually, as I look at it, I think he's (almost) right.
>Shorting the pin to ground tells the camera it's 'A'. The
>difference is that the pin is *recessed* on the camera. In
>order for the lens to short it when set to 'A', the pin comes
>out further than flush on the lens to make contact with the >recessed pin in
>the body.
Perhaps we should say "common" instead of "ground".
>Even if you phonied this up, it wouldn't meter correctly.
No reason why not. This is all that's requried for basic metering in Program
mode. The DS doesn't seem to use the
other "A" contacts to report f/l. Only the "A" pin to set
the mode. Even with the Super Program I don't think it
would matter as metering is a single mode. It might make a
big diff on the AF film bodies, though.
>The one possible way this could work is in the manner I
>described in my other post. Basically:
>
>- Modify the K lens to have the 'A' contacts... including the
>spring loaded one that comes out further than flush to
>activate 'A' mode.
>- In 'M' mode, dial up the same f-stop as what the lens is
>set to.
>
>This would only work correctly if the distance the aperture
>actuator lever moves in 'A' mode is as far or farther than
>necessary to actuate the 'K' lever to where the lens's
>internal stop is set. I haven't figured out what the
>log/linear distances would be and if it's possible.
Because of the backward compat. between AF/K/M lenses the
levers all move the same distances. Nothing internal
to worry about. All that needs to be done is to set the
lens @ f22. It will stop down as requested.
>There are a lot of issues with the scenario. It would be a
>*LOT* simpler if the camera would just allow you to manually
>set the f-stop when using an A lens in non-A mode (i.e. a
>modified K lens).
>
>Phew... that was ugly... :)
>-Cory
Making "A" pin contact by whatever method should provide the
same net result. Because all "A", "F", and (iirc) early "FA"
lenses are "stupid" lenses.
So ...
Does anyone have a K lens that I could obtain & play with?
Perhaps 55/1.8 in trade for St. Ansel?
Sincerely,
Collin
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