This is very instructive. If you can find the name of the third party "holder maker", I would be glad to give it a try (Hopefully for a 800/850 family)
As you wrote, I'm not too happy with the "permanent glasses" on the Epson holders; although I think it was design to hold the emulsion flat so the scan could be equally good from side to side. Your recollection of seeing no improvement is informative. I keep testing the scans...
Cleaning and keeping all these surfaces free from dust is a burden. If I use my "old" Microtek i800, the holders are quite good (no glass) although there is no adjustments.
All my negs (be it 35mm, 6x6, 6x9 or 4x5) have been kept out of the light and in archival glassine, in holders that kept them flat. For me, I don't see the use of glasses in holders.
One thing is that I use a Nikon scanner for my 35mm; when using the Epson (although the scans are quite good) I can "see" at 300% enlargement in PhotoShop (yes I'm finicky), there is some jagging in the scan. You'll get some screen captures in your email.
Thanks again
Jacques Caron
Le 2017-07-09 à 08:34, Myron Gochnauer goch@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> a écrit :
Yes. I have the V800, which works the same way. Epson finally realized that their manufacturing tolerances and quality control were not fine enough not to require minor adjustment by at least some end-users.Actually this is possible on the V850. The "holder" for films all have these notches to raise or lower the emulsion vs the glass. I don't know if it helps but I made some test nd, yes, there is a big difference.I used to have a 4870, and bought a much-improved, 3rd party 120 holder. I can't think of the name right now, but I corresponded with the designer, asking whether the Epson might not be improved by replacing the glass platten with one that had an opening (cut out) so that there was no glass at all between the lens and the film being scanned. My recollection is that he said he had tried it but could see no improvement.Myron