Discussion in 'Medium Format' started by laurencecochrane, Feb 11, 2021.
Edit that. If you own a V600 and provide a serial number. Epson will supply it, via e,mail.
Specifically, many scanners can scan larger documents, but the back light for film isn't so big.
You have to read the specifications carefully to figure this out.
Some scanners have two sensors, one for full width and one for a narrower width.
It might be that in some the focal position is different for the two.
That is, ones for transparencies focus slightly above the glass.
Again, this is hard to find in the specifications.
You can use a piece of Anti-Newton glass to cover the film. I have used a mask cut from black mounting board (black all the way through) about 2 mm thick with the glass on top. Anti-reflective glass for picture frames works well and is inexpensive. Place the film emulsion side down, as it tends to cup upwards in the center. That way it touches the scanner glass only at the edges, and the AN glass prevents rings where it touches in the center.
Most "affordable" photo scanners use a microlens array rather than a single, photo quality lens, which place the plane of focus at the surface of the scanner glass. Exceptions would be the discontinued 800 models and the commercial Expression line, with deep bases (4-6 inches) to accommodate the lens and mirrors. These expensive scanners could focus on the glass for documents and about 2 mm higher for negative in a holder. A few had auto focus. For comparison, my Epson Expression 1600 cost $1300 near the turn of the century, with resolution close to the advertised 1600 ppi. These days inexpensive scanners advertise 6400 ppi (and deliver 1600).
You can determine the plane of best focus by placing an steel engineering rule flat on the glass, propping one end up with a pencil, and observing which markings are the sharpest. With a little trigonometry, you can put accurate numbers on that measurement.
If you are serious about MF film, the best approach to scanning for less than $3K (e.g., a used Nikon LS-9000) is to use a lighted copy table with a digital camera. The resolution is as good or better than all but a dedicated film scanner, and about 4x faster, including sorting, cleaning and positioning.
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