For those of you who were interested in my previous question about problems scanning MF B&W film with the Nikon 9000 - I finally figured it out and thought it might benefit some other members here:
Just a re-cap: I scan all my B&W films as positives and convert them later in PS. WIth the MF glass carrier for the Nikon 9000 I had huge problems getting the spacing right between frames - somehow the scanner just wouldn't recognize where one frame ended and th eother started - even though I had specified the correct negative size in the scanner menu.
Well - it turns out the problem lies in the positive thumbnail scan. Once I switched to negative scanning, the scanner did indeed space properly. After the thumbnail view, I can then select which frame I want to pre-scan. The pre-scan is then done as a positive.
There is ONE other option - scan thumbnales as positive (which will give you mis-aligned frames) and then use the strip film offset slider in the "Scanner Extras" drawer to adjust the spacing for a particular frame - but it takes almost longer, then to just re-scan the thumbnales as negatives and then select the frame you want.
I tried cutting black strips to be placed between the frames, but that did not make any difference at all.
I am still baffled why Nikon would not allow you to scan the entire area of the glass carrier - what if I wanted to scan a MF panorama shot? I'd be out of luck.
In any case, the mistery is resolved