armin_seeholzer Posted July 22, 2003 Share Posted July 22, 2003 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! Link to comment Share on other sites More sharing options...
janko_belaj Posted July 22, 2003 Share Posted July 22, 2003 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. Link to comment Share on other sites More sharing options...
ernest_purdum Posted July 22, 2003 Share Posted July 22, 2003 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. Link to comment Share on other sites More sharing options...
armin_seeholzer Posted July 23, 2003 Author Share Posted July 23, 2003 Hi Ernest Not in connection to the lens or the camera! Shutter will be on an other tripod 1-3 mm away from the lensfront just as a free standing element! Only connection will be a darkcloth or something similar! But I don't know if the shutter can be used thad way! Link to comment Share on other sites More sharing options...
struan_gray Posted July 23, 2003 Share Posted July 23, 2003 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. Link to comment Share on other sites More sharing options...
armin_seeholzer Posted July 24, 2003 Author Share Posted July 24, 2003 Hi Struan I'm sealing the space between the lens and the shutter with the compendium from my Arca. I just realist thad this would work fine I think. Thanks! Link to comment Share on other sites More sharing options...
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