Dan Fromm
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- Mar 23, 2005
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Absinthe, thanks for the long reply. I'm glad that you like me. I like you too. And I'm delighted that you know who Don Knuth is. I've met Comp. Sci. BAs who never heard of him and weren't aware that compilations of algorithms exist. I'm even more delighted that you have Steve Simmons' book and are reading FAQs.
About shutters. Look for Mentor and Rakurs cameras, also Thornton Pickard roller blind, for examples of behind the lens curtain shutters and for LUC shutter for an example of an in-front-of-the-lens leaf shutter. There are others of both types.
Packard and Sinar Copal shutters are leaf shutters that are made to go behind a lensboard. There are similar electronically timed leaf shutters for process cameras that can be adapted to cameras with large enough boards. So putting a leaf shutter behind the board is possible, but readily available shutters aren't made to be used this way.
I'm sorry I wasn't clearer. If you've had a 35 mm camera with a focal plane shutter and seen a lens in shutter, be it on a 35 mm folder or on something larger, you've seen the widely-used solutions. To learn more, look for "shutter efficiency." Come to think of it, some 35 mm leaf shutter SLRs had the shutter completely behind the lens. Not a viable approach, it is dead.
I gather that you, like many of us, are trying to do things on the cheap. Fine, wonderful, but there are good reasons why few of us make our own shutters or use shutters from SLRs to time exposures with large lenses.
Good luck, have fun,
Dan
About shutters. Look for Mentor and Rakurs cameras, also Thornton Pickard roller blind, for examples of behind the lens curtain shutters and for LUC shutter for an example of an in-front-of-the-lens leaf shutter. There are others of both types.
Packard and Sinar Copal shutters are leaf shutters that are made to go behind a lensboard. There are similar electronically timed leaf shutters for process cameras that can be adapted to cameras with large enough boards. So putting a leaf shutter behind the board is possible, but readily available shutters aren't made to be used this way.
I'm sorry I wasn't clearer. If you've had a 35 mm camera with a focal plane shutter and seen a lens in shutter, be it on a 35 mm folder or on something larger, you've seen the widely-used solutions. To learn more, look for "shutter efficiency." Come to think of it, some 35 mm leaf shutter SLRs had the shutter completely behind the lens. Not a viable approach, it is dead.
I gather that you, like many of us, are trying to do things on the cheap. Fine, wonderful, but there are good reasons why few of us make our own shutters or use shutters from SLRs to time exposures with large lenses.
Good luck, have fun,
Dan