Using a Nikon D600 to scan 35mm bw negative film

I hope this thread gets lots of responses.

I use this device http://www.thingiverse.com/thing:22985

with my D800e and a Nikon 105 macro lens to "scan" 120 negs.  Frankly my results haven't been as good as yours but I hope will get better as I spend more time getting the lighting right.  You've motivated me to get back to the task and try to figure this out.
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Jim
http://jmlphotography.smugmug.com/