I think that your not taking into
account that at high speeds the
actual time varies more vs. the aperture
used than with slow shutter speeds. For example if the lens fstop
setting is wide open its going to take
longer for the shutter to be fully open
and also will begin to close faster thus
causing an under exposure relative to the
same shutter operation with a very small aperture like f22.
JCO
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of T Rittenhouse
> Sent: Monday, April 08, 2002 2:37 AM
> To: [EMAIL PROTECTED]
> Subject: Re: Leaf Shutters
>
>
> Properly calibrated they do not overexpose, much. The story that they are
> all slow is just a fiction from people who checked them with a
> shutter speed
> checker and did not compensate the increase in efficiency at high
> speeds. If
> you think a minute you will realize that a leaf shutter takes the
> same time
> to open and close at all speeds, but the percentage of the total time open
> is higher at higher speeds. That means that if you don't take that into
> account the shutter speed will appear to be slower than it is and
> hence the
> supposed overexposure. In fact, that is not true in reality if the shutter
> is properly calibrated.
>
> Ciao,
> Graywolf
> http://pages.prodigy.net/graywolfphoto
> ----------------------------------------------------------------
>
>
> ----- Original Message -----
> From: Shel Belinkoff <[EMAIL PROTECTED]>
> To: Pentax List <[EMAIL PROTECTED]>
> Sent: Sunday, April 07, 2002 10:20 PM
> Subject: Leaf Shutters
>
>
> > I believe that there are some leaf shutter lenses for the 645 and the
> > 6x7 Pentax cameras. In several places it's been noted that at higher
> > shutter speeds (1/500) leaf shutters tend to overexpose, due to the way
> > they're designed. Has anyone here experienced this? About how much
> > overexposure have you noticed?
> > --
> > Shel Belinkoff
> > mailto:[EMAIL PROTECTED]
> > http://home.earthlink.net/~belinkoff/
> > http://home.earthlink.net/~belinkoff/darkroom-rentals/index.html
> > -
> > 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 .
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