New answers tagged medium-format
Nothing beats a local shop when it comes to speed. I can have my film developed in 1 hour if I want/need to in my local shop. And they know their business, not doing some nonsense with my film. I only send a b&w film to one of the big services and it was a disaster with a greenish color cast and quite expensive. Assuming the location in your profile is ...
Short answer: you have to use a microscope, a drum scanner or some specific scanners for film. Flatbed scanners barely reach 1500 dpi (real, effective, measured on the details you get, not on the number of pixels you get), see http://www.filmscanner.info/EpsonPerfectionV600Photo.html and the other ones. This is a measurement of actual details in some 120 ...
Or you can use a macro lens to scan your film. I've found this to give better results than anything short of a very high-end scanner. Use a digital camera, a macro lens and a lightbox of some sort mounted in a copy stand. For even better results, make multiple images of parts of the negative and stitch them.
It depends on the film: your estimate would be valid for old Panatomic-X using Beutler processing (I calculated ~116 Megapixels (MP) for a 6 cm x 6cm image, 180 lines/mm). Adox, though, claims about 500 MP for its CMS II High Resolution Film. So, yes, if you want to take advantage of the full resolution, scanning at ~9,600 DPI (~400 DPMM) would produce ...
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