Hi! Finally I want to expose some findings: scanners where the scanning carriage moves with the belt - distort. Scanners where the process is made by lead screw - do not distort. Sad, but true.
I found it accidentally while comparing different scans of the same 35mm negative. I will not show mine, but let's look what he have on the net.
The moving gif is made from two crops from that page:
http://trichromie.free.fr/trichromie.../03/02/ScanC41
Two scans were made on IQSmart3. On a gif you can see the difference - it moves. What can be if the face will be scanned in that area? I tell you: nothing good. The face will loose right emotions and will be distorted.
If one wants to explore that, he can visit the page:
http://www.largeformatphotography.info/scan-comparison/
There is a lot to compare. And nearly only drum scanners do not distort. They simply have lead screws. Do not distort: Topaz, Nexscan and Smart 3XX. They also own lead screws.
Having said all that on a large format photography forum I understand that the larger the original the less is the distortion effect. Anyway I think it is good to know that such thing as a geometrical distortion of the belts exists in this not perfect world.
Take care
Al
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