It's a quick read and seems pretty informative.
https://www.35mmc.com/06/09/2018/scanning-emulsion-getting-flatbed-scanner-david-narbecki/
https://www.35mmc.com/06/09/2018/scanning-emulsion-getting-flatbed-scanner-david-narbecki/
It cracks me up that people regurgitate things from the past like they invented them. I have been scanning straight on the glass with an anti newton sandwich for a decade probably and I am probably not the one that thought of it first. Not the ideal method, but it works. You can get anti glare plexiglass for a few bucks at Home Depot.
https://www.homedepot.com/p/Plaskol...in-Non-Glare-Acrylic-Sheet-1X09241A/301109740
No. I thought of it first.
Doesn't the manufacturer design and calibrate the unit.>>A poster here gives the best height setting for the Epson holders<<
There is not a single best height that applies to all Epson scanners and their film holders! Each person has to test for their scanner on their own AND make sure they have their film absolutely flat during the test or they will get a false reading. From the feedback I have received, the majority of people find their V7xx/V8xx scanners require in the 2.5 to 3.25 mm height range but it is not uncommon for people to report 2.25 to 3.5 mm (with some people reporting even farther out along the curve).
Don't rely on what other people report works for them. Take a small amount of time to test for yourself. Short-cutting very likely will short-change you and your scans!
Doug
Scanners are not individually calibrated hence there is variation in focus plane.Doesn't the manufacturer design and calibrate the unit.
who calibrates the focus point by adjusting the mirror in a dslr so it is correct?
How do you know the manufacturer does not calibrate their equipment before shipping? It seems to me the the manufacturer designs the focal point of the lens to focus at the level where the film will be held by their film holder. At a minimum, the lens bracket holds the lens so that it will focus on that point.Scanners are not individually calibrated hence there is variation in focus plane.
From the manual for the Epson Perfection V850:How do you know the manufacturer does not calibrate their equipment before shipping? It seems to me the the manufacturer designs the focal point of the lens to focus at the level where the film will be held by their film holder. At a minimum, the lens bracket holds the lens so that it will focus on that point.
These instructions do not mean Epson doesn't calibrate it at the factory to focus on the nominal setting of the film holder. They just give the user the option to recalibrate it or change the calibration at home. Frankly, the instruction, "...which may differ frame to frame or image to image..." asks a question. What would cause that to happen?From the manual for the Epson Perfection V850:
Image is Distorted or Blurry
If a scanned image appears distorted or blurry, try these solutions: • Make sure your original is not wrinkled or warped. This may prevent the original from laying flat on the scanner glass. • Do not move your original or your product during scanning. • Your product will not operate properly while tilted at an angle. Place it on a flat, stable surface that extends beyond the base of the product in all directions. • Adjust these Epson Scan settings (if available) and try scanning again: • Select the Unsharp Mask setting. • Adjust the Auto Exposure setting. • Increase the Resolution setting. • Click Configuration, select the Color tab, and adjust these Epson Scan settings (if available): • Continuous Auto Exposure • Click Recommended Value to return the Auto Exposure Level setting to its default value. • If the solutions above do not work, move the sliders on the film holder to adjust the height between the film holder and the scanner glass. You may need to scan at different heights to determine the optimum 90 focal point for your film, which may differ from frame to frame or image to image. Set all the sliders to the same height. (Their default height is 0.12 inch (3 mm) and indicated by the arrow symbol.) 1 0.18 inch (4.5 mm) 2 0.16 inch (4 mm) 3 0.14 inch (3.5 mm) 4 0.12 inch (3 mm) 5 0.1 inch (2.5 mm)
(Emphasis added by me).
Epson now includes film holders with adjustable height so you can fine tune the focal plane for maximum sharpness. Users here have reported different adjustments.How do you know the manufacturer does not calibrate their equipment before shipping? It seems to me the the manufacturer designs the focal point of the lens to focus at the level where the film will be held by their film holder. At a minimum, the lens bracket holds the lens so that it will focus on that point.
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