From: Shannon Stoney (shannonstoney@earthlink.net)
Date: 12/18/02-01:23:11 PM Z
Thanks to everybody who posted answers to my question about making a pinhole
telephoto "lens." I am not sure I understand the discussion completely, but
it has given me a lot to think about.
Joe wrote this:
> Most photographers incorrectly call long lenses with narrow angles of
view
> "telephotos" while in fact they are just longer than normal focal lengths.
This is news to me, and I"m glad to know it. Therefore, there can't really
be a pinhole "telephoto" setup.
I guess to really understand how a telephoto lens is different from a lens
that just has a long focal point for your format, you would have to take one
apart and look at it.
But, to get back to the original practical problem, which was how to make a
photograph of a small slice of the landscape, similar to what you would see
if you held a 4x5 hole arms length from your face: is that impractical,
given the size of the lens that would be required for an 8x10 camera, say?
Sandy suggested that it is. Therefore the pinhole solution might be the
cheapest and lightest way to do it. The big problem would be, as Sam
suggested, to keep wind from shaking the camera during the long exposure. I
suppose there would be bellows extension factor as well as the usual long
pinhole exposure times. Maybe on a sunny relatively windless day?
--shannon
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