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Erik Magnuson
Guest
That's 7 MP measured resolution. I do the math above/below to show that the "measured resolution" equivalent of your 60D is only about 10MP -- if you also account for an entire optical & processing system.Eh? I was quoting the V700 review on the FilmScanner.info site. He is the one that rated the V700 as only giving about 7 megapixels.
It would take about a 12mp camera to get 2300+ measured dpi. Still common but 2 generations newer than a 20D.A 20D is a common digital camera whose resolution is greater than 7 megapixels. Your quarrel is with him, not me.
That's part of the optical path of the system, so it's included in the measured data from the scanner review.And the layer of glass between the slide and the optics.
If you'd mentioned the specifics instead of generalities at the start your comments would have been more relevant. You need to have to have a specific setup to get your results and would need to include the setup time to make the total time to scan N images the same. It may not be a lot but if you don't have dedicated space, then it's get our the lights and tripod, setup, and run a test image. A scanner takes dedicated deskspace instead of other space. For me, it's just power on, start the SW, and insert the slide. The total time spent also depends on how much you like to tweak. If you are scanning a lot of different emulsions of different dyes and fading, the scanner may be quicker to tweak. (That's the other part of the OP's issue you glossed over - the problems of old slides.)With the XTend-a-Slide my slides are perfectly aligned with the lens. The slides are also as flat when they are mounted in the XTend-a-Slide as they are when mounted in a scanner.
My point was only the resolution you can actually deliver to a file is a lot closer than your numbers implied (e.g., ~10MP as measured for the 60D vs. 7MP as measured on the 750.). The next generation of cameras will come closer to your promise.If you want to derate the DSLR because of AA and demosaicking issues, modern 16-24 megapixel DSLRs (that are all long in the tooth and will be replaced with higher resolution models shortly) will still beat 7 megapixels. I don't think that anybody claims that modern DSLRs have less than 8 actual megapixels.
That's true. Of course in the real world, few old 35mm slides actually have that much detail for it to matter (exceptions would be if the photographer typically used only the best lenses and a tripod.)Scanners are a dead end. DSLRs are improving by leaps and bounds.
Presumably the inside of the tube is flocked. But in either case, old slides will have even less DR than the scanner or the camera.Nailing exposure isn't difficult. It isn't like the slides are running around. The XTend-a-Slide is a sealed chamber between the front of the lens and the face of the slide, so I don't see where reflections would come from.
The Nikon HW + vuescan implementation is much better. I'd need to test if vuescan does better on the Epson than the native SW.This is I will yield on if you can get ICE type auto-dust/scratch removal to work. I tried a bunch of times with my V600 and only got about a 10% success rate.
Exactly my point. If DSLRs typically resolved to the Nyquist limit, then that could be a valid comparison. But since they don't, it would be best to compare measurements to measurements.??? I quoted a review for the scanner resolution and then listed the manufacturer's megapixel rating for a DSLR.
IT-8 targets don't have resolution scales - you can only measure resolution by going past it to finding the actual limit. I don't dispute that your setup is noticeably higher resolution than the Epson V600 and even the V750. But your estimates were much too high for what a real would test would likely show.I have to go out shortly. When I return, I'll post images from a Kodak IT-8 target. Kodak IT-8 targets are readily available and anybody can duplicate the tests.
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Erik

