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by yzydserd 911 days ago
I have hundreds of old rolls of B&W film I want to scan. I was looking at the v850 which seems to have a 6400dpi resolution which is ~60MP for 35mm film. Or a plustek opticfilm. Can you clarify what sort of camera based rig at a similar price point would be superior? Where’s the 4x resolution come in?
2 comments

You can scan a 35mm frame at 1200 billion megapixel it doesn't mean you get 1200 billion megapixel of usable data

Most scanners top out at 60% of their claimed resolution, which means scanning at 6400dpi gives you something closer to 3200dpi, for the v850 it's a bit worse actually

https://www.filmscanner.info/en/EpsonPerfectionV850Pro.html

> According to our resolution chart, this equals an effective resolution of about 2300 ppi

I have side by side of cms20 film zoomed in at 100% that show a much much much better level of details on my camera based setup than on the Epson v850 and plustek 8100.

> Can you clarify what sort of camera based rig at a similar price point would be superior?

Any modern FF camera (>2012) with any semi decent macro lens (nikkor 55 3.5) will produce better results, even if marginally, while being much faster. You can get a Sony a7rII and a macro lens for less than a v850, then you need a light source (led panel, laptop screen, ebook screen), two panes of glass to hold the film flat and some kind of tube to hold the camera on top of the negative. If you're on a budget you could probably make it work for half of the cost of a v850

It takes less space and you can use it as a camera, while the scanner is just a scanner

While a lot of scanners advertise crazy high resolutions, this is often just marketing mumbo jumbo. They only resolve details at half or a quarter of the claimed resolution. See www.filmscanner.info for tests of the resolution on many scanners. My Nikon CoolScan scans at 4000 dpi and has an insanely sharp lens, which is enough to resolve the grain on most 35mm film stocks. Unless you shoot a lot of 50 iso and lower, thats more than enough
See also this: https://www.film4ever.info/vtt for a affordable test target.