Nikon 8000 fluid mount 120 glass carrier

["Ernst Dinkla" <E.Dinkla@xxxxxxxxx>]

So far made two scans with my DIY fluid mount 120 glass carrier
for the 8000. Measured with the Nikon manual focus it had 7 units
focus difference over an area of 170 x 57 mm at the extreme
corners.
The other focus points were within those extremes. A 6x9 negative
had grain sharpness on all spots.
Have not yet compared the colour shift with a positiv scanned
with the glassless carrier and this carrier. I doubt there is
much difference though. So far the auto exposure seems too light
if compared with a glassless scan. Wonder what the reason is for
that. It can hardly be that this optical path is better than film
only.

The carrier is based on the FH-869M 120 slide carrier. All that
is raised above the plane the slides rest on is removed. Areas
lower than that plane are filled with black expanded PVC sheet
(Sintra, Forex). The two windows are united to one with the same
proportions at the start as the normal glassless 120 carrier.
Three extra code holes to bring the total to five for all
possible codes. Two are taped to let the scanner think it is the
120 glassless carrier.
Glass 285 x 115 mm and 2 mm thick is attached with two sided thin
tape and around that with one component foaming polyurethane
glue. The last is more or less solvent resistant so is also used
to cover the ABS? plastic carrier on the spots where the mounting
fluid may get. Two small clamps bended of metal strap strip are
used to clamp the transparant polyester foil to the glass at the
side that goes in first for scanning. That way no tape is needed
as that usually gives a mess. Between the polyester foil and the
glass the film is sandwiched with mounting fluid on both sides. A
squeegee squeezes the excessive fluid plus bells away. At the end
is an aluminium strip to let the fluid drip on a cloth so the ABS
carrier is not dissolved. Some silicon glue is used at the clamps
side to seal that part from the mounting fluid.

Scanned some curly 120 film (two 6x9's) and a 57 x 84 mm part of
a 4x5 inch film . The 115 mm width of the glass is enough to
accomodate the 4x5 sheet without cutting the film.

Ernst



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