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#Canon canoscan lide 20 professional
It can do 1600 dpi 16-bit grayscale scans for B&W, which is more than adequate for home use, but probably a little lacking for professional work. The transparency adapter comes with a frame for holding slides or film strips, so the scan lines up the frames correctly. Given how cheap this hardware is now, is it really worth your while arsing about with homemade light-boxes? Current model appears to be the 1670, which looks almost identical. Similar to bflat, I've got an Epson 1650 Photo scanner - the "photo" model comes with a transparency adapter and a copy of Photoshop Elements 2, and is priced very reasonably - about 90 quid here in the UK. I wonder if holding one of those little light boxes for viewing negatives up to the scanner would work. This was a miserable failure, I'm guess because it's too bright. I thought about that aspect of the problem a bit and did a couple of brief tests by scanning while holding a flashlight behind the negative. Do a search for "Transpancy Scanners" and you will find units, or adapters that will allow you to do what you want. Seems the price range was in the 300 to 500 dollar range. I have found several scanners with large light hoods that would allow you to scan individual, or whole sheets of negs. I would also like to scan into the ole 'puter. As a former professional photographer, I have over 50,000 negs. Your scanner only supplies a reflected light source.
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Whether a negative, or a transparancy, both are dependant on transmitted light. Unfortunately, I cannot give any help with your situation,other than to say I have never been able to do this.