Hi,
Some more points to add:
In theory slides are sharper than negatives because with slides the
not-exposed (= the smallest) grains are used, while in negative film the
exposed (= biggest) grains are used for the picture. In Kodachrome film,
which is a sort of three layer B&W film, the theory is almost practice (in
Kodachrome film the dyes are added during the developement process). This is
why Kodachromes are so increadible sharp, while the grain is not very small.
E6 films have dozens of layers with the dyes already included. E6 film is
therefore thick compared to Kodachrome, with diffusion effects as a result.
The resolution of E6 film is often much lower the the grain size. For
example K64 has a higher resolution than Velvia 50, even though the grain of
Velvia is much smaller; K200 looks very grainy, but has actually a fairly
high resolution.
Happy New Millennium!
Erwin Voogt
Utrecht, The Netherlands
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