> "R. Lee Hawkins" <lhawkins@xxxxxxxxxxxxxxxxxxx>wrote:
>Jan Steinman <jans@xxxxxxxxxxx> wrote:
>>I beg to differ. I have a T-mount that is right on, and another
>>that is two stops off. I can swap them on the same lens and see
>>coupling pin and detect a difference.
>This is not the same thing as saying "If it is a T-mount lens, then
>all bets are off for proper metering, because the T-mount
>manufacuturer has no idea about the speed of the lens it will be
>mounted on." !!! Your first statement implies that you will not
>likely ever get a proper meter reading with a T-mounted lens,
>regardless of whether it is properly constructed or not. I think
>that this is the statement that Herr Hertzler was taking exception
>to --- it is not a correct statement. While I agree with you that
>if the T-mount is constructed incorrectly then proper readings will
>be impossible, it is not *generally* true about T-mounts.
Yes Lee, thank You! That's what I wanted to say.
A T-mount adapter for OM is a specific item, made to fit only OM
cameras. If it is not malfunctioning, there is only one correct
postion of the aperture pin. And that position is correct for all
lenses, regardless of the aperture. It is the same with the old
Olympus non auto tubes: You can use them with all lenses, the pin has
one fixed position - the "open" positon - to tell the camera that the
aperture will not stop down any further, when taking a picture.
Regards, Christoph
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Christoph Hertzler hertzler@xxxxxxxxxx
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