The Nikon 4000ED is a remarkably sharp, capable scanner with 35mm film.
It's not quite as sharp (particularly around the edges), or quite as
good at penetrating the shadows as the Imacon, but it offers far
superior automatic dust and scratch removal, and is a very cost
effective solution.
We've scanned the images for a number of published books on
the Nikon with great results. We have done literally thousands upon
thousands of scans on the Nikon, and we really know how run this
machine. Obviously we use much better software than the Nikon supplied
software, for much more accurate colour, and our machine is regularly
calibrated with an IT8 target to further improve colour response.
The Nikon has hardware based automatic dust and scratch removal. This
is the one area that the Nikon really excels in - the Digital ICE3
solution is remarkable and in 99% of all cases will leave you with a
completely clean scan requiring absolutely no further spotting work.
Really large scratches and fingerprints will not come out so well and
will still require some manual work.
Contrary to popular web mythology,
Digital ICE3 does NOT soften scans (and this is quite easily testable
with two side by side scans that are pixel for pixel the same, except
for dust!). Immediately around the dust itself there is very slight
softening, almost always invisible to the eye under normal viewing, as
is to be expected (the scanner interpolates the data where the dust was
using the surrounding pixels). Digital ICE3 only works with colour dye
based films - i.e. normal colour film like Velvia, Portra, and also
chromagenic black and white films. It does not work with true black and
white film (and film based on silver rather than dyes).