I was curious about something and wondering if someone with the Pentax
67 165mm f/4.0 LS lens or its manual could answer a question I
have about the operation of that lens. I don't have the lens or
a manual for it to examine or try myself.
When the camera's shutter release is triggered, the auto-aperture
coupling from the body steps down the aperture and also triggers the
shutter. I can see two behaviors for this particular leaf shutter,
and I was wondering which is correct:
1) The leaf shutter stays open and starts running it's timer.
When the time runs out, it closes the leaf shutter. In other words,
the first curtain of the focal plane shutter acts as an open-shutter
event, and the actuation of the leaf shutter after delta-t acts as
the close-shutter event. This would seem to reflect the "not quite
a leaf shutter" comment that has been made.
2) The shutter closes immediatetly so that when the focal plane
shutter opens, no light is admitted. Then the leaf shutter opens and
closes depending upon it's own delta-t timer again. This is the true
leaf-shutter mode. However it is more complex than the first scenario.
If the manual has the answer, that would be great. Otherwise, I
suppose one could determine this by triggering the 165 LS manually
and observing if it
1) closes from the open position after shutter time
or 2) closes, then opens and closes again after shutter time?
Thanks for any info.
Bolo -- Josef T. Burger
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