Dear Sandy,
For the moment, I am not using any fluid between the glass and the negative, and I lay the glass on top of the negative, pressing the negative's emulsion against the scanning bed glass, and the negative is set within the boundaries of the Epson film guide holder. I use the glass to keep the negative flat during a scan. The anti-reflective film on the back of the Museum Glass prevents moire, as it touches the back of the film. I obviously modify the image in Photoshop afterwards to correct the orientation of the negative.
I will, however, change that approach shortly to try to realize the benefits inherent to the wet mounting process. I read an article, submitted by Ernst Dinkla, on the Yahoo ScanHi-End newsgroup that intrigued me, and I shall try his approach to fluid mounting with a flatbed scanner. It is not unlike your method, but there are differences, and Ernst discusses the focal point of the lenses, the orientation of the film and a few other points of interest. It is interesting reading. If you are interested, it is the message number 13858 within the Yahoo ScanHi-End newsgroup, located here:
http://tech.groups.yahoo.com/group/S.../message/13858
You should be able to read this message, but you will probably be asked to submit your Yahoo Id, and password...
jim k
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