f0t0fan
journeyman
Reged: 05/07/2007
Posts: 73
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I have been trying to use a bellows and slide copier attachment in conjunction with my DSLR (Pentax K10D). The bellows/slide copier assembly assumes the use of a 50mm lens. In trying to use this with a camera with an APS-C sensor I have hit a problem - with a 50mm lens I cannot get full coverage of a 35mm slide because of the magnification effect.
Now comes the catch 22. If I move the slide holder further away from the lens it goes beyond the infinity focus of the lens because of the built in extension inherent in the bellows. But if I try to use a 35mm lens with the slide holder in the normal position I hit the same problem. The extension puts the lens beyond the infinity focus position.
Any ideas as to how I can overcome the problem short of waiting for Pentax to introduce a full frame sensor.
Please note that I already own a dedicated slide scanner - a Scanwit approx 6 years old. The resolution on this is still quite good - approx equivalent to a 12 Meagapixel camera but the noise level is much higher than a modern DSLR hence my attempts to use the bellows/slide copier combination.
Any ideas would be welcome.
Thanks in anticipation
Ron D
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Nod
Carpal \'Tunnel
Reged: 08/04/2006
Posts: 4194
Loc: Devon, UK.
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Not sure if anything from this lot http://www.kauserinternational.com/Photography/Ohnar/ohnar.htm will be better than your current set up?
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MATWSIJ.....
To avoid being offended, please insert apropriate smiley.
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Malcolm_Stewart
Pooh-Bah
Reged: 11/07/2005
Posts: 2400
Loc: Milton Keynes, UK
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The question I'd ask is, before spending any money: Are you satisfied with your results even though they are cropped compared to your originals? I found that when copying to a compact digicam the results were always too contrasty, (impossibly so on my better slides) and when I moved to a DSLR, I had to lower contrast and saturation significantly before I was half satisfied with the results. I then found that the process was very slow as my slide holder didn't precisely position the slide (very noticeable when copying at 1:1 to a full frame DSLR), and it took time to get it in the right position.
Sorrow to sound negative (I had several thousand slides to copy), but I now use an Epson 4870 PHOTO scanner which does an adequate job with anything from 35mm slides to 4"x5".
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Malcolm Stewart
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El Sid
Going potty
Reged: 14/04/2003
Posts: 9311
Loc: Sussex-by-the-Sea
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TBH Ron I think you'd probably be better off sticking with the slide scanner... I have tried copying slides onto digital using a slide copying attachment which fits on the front of a normal lens. Like you I have had problems with cropping and it can be a bit tricky to get the right extension to keep within the available focus range. Even when I manage to get it all lined up I'm not sure the set up is capable of recording the very fine detail in the slide. Comparing the digitised version with the original projected does suggest that much of the finest detail visible when projected has not been captured by the camera.
Occasionally I have thought about getting some sort of back projection screen and copying the slides that way... IIRC that's what Julie Durn used to do to make duplicates of her slides.
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Nigel
Completely BSRIPN 
ElSid Gallery
A camera in the hand is better than one in the cupboard........
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f0t0fan
journeyman
Reged: 05/07/2007
Posts: 73
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Thanks for your comments everyone. As I feared there is no easy answer to this problem. I think that at present I shall put the matter on the back burner and wait for the long dark evenings to arrive before trying again. It seems from your comments that your experience of transfering slides to digitalmirrors my own ie the results dont live up to expectations.
Before I try again I think that I will get a few 'difficult' slides copied professionally just to convince myself its worth persevering.
Cheers
Ron D
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