RE: focal plane shutter theory

The best example of this is on an old speed graphic 4x5. This camera
had a cloth focal plane shutter. I always wanted one just for pinhole or for
odd ball lenses as you could wind up the shutter in the back and not have
to reply on one in the lens. It is composed of different slits and diffent
spring tensions. You wind it up to the right tension and set the slit to the
correct width for your shot then load it with your holder and shoot. I found a
broken one last year (all that was good was the shutter) but have since
gotten interested in other types of images and cameras. You should
check it out. I wouldn't know where to start to think about making my own
shutter like on one of these.

Chris
WPPD 536

>===== Original Message From "Uptown Gallery"
<murray@uptowngallery.org> =====
>This may be off topic, but the breadth of knowledge within this group may
>provide me an answer (off list , if necessary).
>
>I would like to understand (actually, analyze) the operation of a focal
>plane shutter, for the purpose of building one for sheet film. I want to get
>a grasp on calculating exposure duration as a function of slit width and
>linear speed, I guess (or direction to what I should be thinking about).
>
>Thanks
>
>Murray
>
>
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Received on Fri May 10 00:51:15 2002