That is how the *ist-Ds worked as it didn't have a dedicated green
button. Also I think that Bruce meant M not Tv. At least on the K20D
and K-5II pressing the green button with a SMC Pentax [K] or M lens does
nothing in Tv mode, but in M mode it stops the lens down and sets the
more or less correct shutter speed.
The other option is in M mode with the DOF programmed to optical
preview, you can hold the on/off/dof lever in and use continuous stop
down metering kind of like an old Spotmatic, but more awkward as the DOF
doesn't lock in place the way id did with one of those ancient M42 mount
cameras.
I find that to be a bit more accurate than the green button though less
convenient.
On 10/5/2016 2:25 PM, Eric Weir wrote:
On Oct 5, 2016, at 11:56 AM, Bruce Walker <[email protected]> wrote:
And one of the programmable functions of the green button is to push
on that little pin that old Pentax lenses have which closes the
aperture leaves down. I think they call this stop down metering. When
you press the green button it will stop down, take an exposure
reading, and open up again. If you set the camera to Tv, then doing
this will set the shutter speed as appropriate for your selected
aperture on the ring.
Thanks, Bruce. I need to reconstruct my experience with manual lenses,
primarily A lenses, and mostly on a *ist DS. What I did was something like what
you describe, but I don’t think I punched the green button. It was a button up
in the top right corner of the back, right behind the LCD status screen is, and
where the AE-L button is on the K-5. Could it have been the AE-L button?
------------------------------------------------------------------------------------------
Eric Weir
Decatur, GA USA
[email protected]
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