Hi group. My latest project involves shooting medium format rollfilm (6x6
Rollei Pan 25) and drum scanning at 5300dpi to make 40" inkjet prints.
Last week I had a service bureau scan one of my 6x6 rollfilm black and white
negatives with a Heidelberg Premier D7100. I don't have much experience with
drum scanning but my impression is that this particular scan is terrible. The
negative is tack sharp: Rollei Pan 25 shot on a Hasselblad SWC/M using a tripod
and shutter release cable, no wind, 1/125 exposure. My goal is to make 40"
prints and the negative was scanned for 41 inches at 329 dpi (image dimensions
are 13549 x 13680)
The scan has way too much "grain" noise, but I'm not even sure it's grain.
Looking at the negative under a microscope the grain is much finer than some of
the detail that wasn't even recorded in the scan. The scan also looks like it
has some motion blur, as if the negative had moved on the drum - is that
For fun I tried scanning it on my old Epson flatbed and the image actually seems
better (no blur, similar detail, but poorer DR) which doesn't make any sense to
When I look at the negative on my lightbox with a 15X loop it is extremely
sharp, barely perceptible grain, and I can see much more detail than on the drum
scan. What type of result should I be expecting ?
I've included some 100% crops from the center of the image, one from the service
bureau, the other from my old Epson 3170 flatbed.