Evan said "...... I slide the bottom of the neg under the edge of the frame ...." that could be wroking against you for two reasons: 1) you might be ever so slightly buckling the film and 2) all flatbed scanners have a 'sweeet spot' that is the resolution, etc. is better in the center. With the 1800f that sweet spot covers msot all of the 8x10 area but you are still better off centering your material. Oh yeah also 3) of two <grin> the narrow open area in the bottom of the frame/glass holder is the scanner's 'control area' and if you are intruding on that area in any way it will have a negative effect on your scans. BTW I have never had any Newton Rings issues with any sort of film scanneded on the glass (usually 5x7).
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