I asked about the operation of the leaf shutter, and have two
conflicting answers!
Paul Stenquist says:
> Scenario 1 is correct. The focal plane shutter opening is the start of
> exposure, the leaf shutter closing ends the exposure.
William Robb says:
> After much observation, and some debate, my wife, who has very
> fast eyes and I have determined that scenario 2 is the correct
> one. Were it otherwise, there would be no high speed sync
> available, which is why the camera has the built in shutter. The
^^^ I think you meant lens?
> 90mm leaf reopens after the focal plane shutter completes it's
> cycle, the 165mm leaf does not reopen.
To answer William, my thought was that since Pentax was trying to make
the lens simpler that perhaps they built a leaf shutter which just
closed. High speed sync would still be available -- the flash would
fire after the focal plane shutter curtain opened, which would illuminate
the entire frame. Then the "1/2 leaf shutter" would close quickly,
giving the high speed sync. Yes, there could be uneven exposure side
due to the movement of the shutter curtain -- but there is already uneven
exposure center to edges caused by the leaf shutter.
Given the two answers I have one more question/statement ... I think
the deciding factor has to go to the presence of of PC-cord sync
connector on the lens. I've been tracking down photos of the lens,
and finally found one which _I think_ definitely shows the presence of a
PC connector. That implies that the leaf shutter must open and close.
If it only closed then there would be no need for a sync connector,
as the focal-plane-shutter-open event would allow for flash sync.
In other words, does the 165LS have a PC connector? If so, I think
it must work as William reports.
Thanks again for any info!
Bolo -- Josef T. Burger
-
This message is from the Pentax-Discuss Mail List. To unsubscribe,
go to http://www.pdml.net and follow the directions. Don't forget to
visit the Pentax Users' Gallery at http://pug.komkon.org .
