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#41
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Looking for film scanner
Resolution isn't a reliable scanner specification, since it's mostly stated in terms of the mechanics of the scanner, rather than as any sort of measured ability to resolve things. The Epson scanners in particular are known for using multiple offset lower-resolution sensors, and claiming 2x the resolution. The quality of the optics and any mirrors in the light path, and how well the film holders hold the film flat are key factors in getting high quality results. The flatbeds generally have extra air-glass interfaces in the light path, and not even coated glass. I've scanned 35mm slides and negs on a number of flatbeds and a number of real film scanners, and the difference is night and day. You can't make a reasonable choice just from the numbers cited by the manufacturers. Well that makes sense, I don't scan much anymore but I have been thinking off and on about getting into medium or large format and I would want to scan those negs. So, if the resolution spec is not reliable, how do you determine which scanner will, in the end, give me the largest print? |
#42
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Looking for film scanner
"DBLEXPOSURE" wrote in message
... Resolution isn't a reliable scanner specification, since it's mostly stated in terms of the mechanics of the scanner, rather than as any sort of measured ability to resolve things. The Epson scanners in particular are known for using multiple offset lower-resolution sensors, and claiming 2x the resolution. The quality of the optics and any mirrors in the light path, and how well the film holders hold the film flat are key factors in getting high quality results. The flatbeds generally have extra air-glass interfaces in the light path, and not even coated glass. I've scanned 35mm slides and negs on a number of flatbeds and a number of real film scanners, and the difference is night and day. You can't make a reasonable choice just from the numbers cited by the manufacturers. Well that makes sense, I don't scan much anymore but I have been thinking off and on about getting into medium or large format and I would want to scan those negs. So, if the resolution spec is not reliable, how do you determine which scanner will, in the end, give me the largest print? The one with the highest optical resolution for the film format you are scanning. Print size is determined by the size of the film and the resolution of the scan and the resolution you print at. Example: 35 mm film = 24 mm x 36 mm frame size. Assuming using the maximum image you can get out of the film and the print. (Not trying to use a standard print size). Scan at 3200 dpi (the max for some scanners) dpi and ppi are interchangeable. (25.4 mm per inch) Convert mm to inches. 24 mm / 25.4 = 0.945 inches short side 36 mm / 25.4 = 1.417 inches long side 0.945 inches * 3200 dpi = 3024 pixels 1.417 inches * 3200 dpi = 4534 pixels Scan 35 mm film full frame gives you a 3024 X 4534 Pixel image when scanned at 3200 dpi. Say you print that image at 300 DPI (best print) 3024 pixels / 300 dpi = 10.08 inches 4534 pixels / 300 dpi = 15.11 inches You end up with a 10 x 15 inch print from full frame 35 mm film. If the scanner is a 3200 dpi scanner. Fitting the scanned image to standard print sizes is another subject. You have to crop somewhere! -- CSM1 http://www.carlmcmillan.com -- |
#43
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Looking for film scanner
DBLEXPOSURE wrote:
Resolution isn't a reliable scanner specification, since it's mostly stated in terms of the mechanics of the scanner, rather than as any sort of measured ability to resolve things. The Epson scanners in particular are known for using multiple offset lower-resolution sensors, and claiming 2x the resolution. The quality of the optics and any mirrors in the light path, and how well the film holders hold the film flat are key factors in getting high quality results. The flatbeds generally have extra air-glass interfaces in the light path, and not even coated glass. I've scanned 35mm slides and negs on a number of flatbeds and a number of real film scanners, and the difference is night and day. You can't make a reasonable choice just from the numbers cited by the manufacturers. Well that makes sense, I don't scan much anymore but I have been thinking off and on about getting into medium or large format and I would want to scan those negs. So, if the resolution spec is not reliable, how do you determine which scanner will, in the end, give me the largest print? You can't pick the right one by simple inspection of specification numbers. If you *really* need the "largest" print, then look into getting a commercial drum scan done at their top res. Unfortunately, price is a fairly reliable guide; small price differences don't mean much, but consumer flatbeds are bottom of the heap, professional graphics flatbeds (like the Epson V750) rather better, dedicated film scanners like the Nikon Coolscan 9000ED (for medium format) are much better, and the commercial-grade scanners like the Flextight and the real drum scanners are better still. The difference between a flatbed and a film scanner is much bigger than the difference between any two film scanners. |
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