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Sinar Copal behind the lens shutter?


armin_seeholzer

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Hi all with knowledge about Sinar Copal shutters.

I read + heard this shutters are killing maybe the sharpness of the

pictures if they work behind the lens as they designed for.

But could anybody tell my if it would be possible to put them in front

of the lens on a second tripod 2-3 millimeters away from the lens

under a darkcloth on a Sinar Standard and rail could thad work in front

of my Arca?

Or is the connection to the lens needed for the shutter working?

Hope the question is clear with my bad english!

Thanks for all usefull tips!

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Well, I can't tell you from my own expirience, but I have seen slides made

with that shutter. Outstanding. Sharp, rich in colour. Sharp again. Author was

working with apo-sinaron on 8 by 10. That's all I know. Slides were

ektachrome... I was then working on scanner and got those slides on my

drum, latter I become friend with that man, so I may ask him what he think

about that shutter and sharpnes... but again, what I have seen - don't worry.

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Armin, your English is much better than I can manage in any other language. The only time a shutter can have any optical effect on the image is while it is partly open. I suppose you could theorize means by which this could reduce sharpness, but I doubt if you could find any difference in an actual negative. Mechanically, if it causes shake, the image will, of course be harmed (I've seen this with roller-blind shutters) but the Sinar opens symmetrically, so that shouldn't be a problem, either. Mounting the shutter in front of the lens should be no better, or worse, than with it in the original position.
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Armin, I see no reason why this couldn't work. The shutters can

operate in automatic stop down mode, and the modern ones

can control the lens's aperture, but neither is necesary. Just put

it in front of the lens, use the lens' own aperture, and fire away.

You will need the special cable release, but not the automatic

stop down/close cable.

 

The only problem I can see will be sealing the space between

the shutter and the lens so that no light can leak in when the

shutter is closed. The old Norma bellows had one end with a

circular hole in a plate. It would be easy enough to glue a filter

thead adapter to it so that you could mount it directly onto the

front thread of your lens - leaving the controls accessible.

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