Mats,
>Interesting way of determing DOF. I wonder if it works with Vuescan and a
>Canon FS2710??
The method requires software and hardware that gives you a readout of focus
position, and allows you to set that focus position. I doubt that the
Canon does this, in which case you can't do it.
>I don't know much about the Nikon scanners (I have a Canon FS 2710). But I
>think there MAY be a flaw in the above method of determining DOF.
>
>I just think that it may actually be that the "Nikon units" are not the
>same size on two different models of scanner, because I have a feeling that
>they may be stepper motor steps from some point (or something along those
>lines).
Yes this is correct, but I wasn't attempting to compare between
scanners. The idea is that for your own (Nikon) scanner you compare your
own 'usable DOF' with your own measured 'film curviness'. If the film sits
in your scanner with a measured flatness (measured using the scanner's
focus units) such that the film location variation is less than the
measured scanner DOF (also measured in scanner focus units) then you are
doing well - your scans will be in focus.
In my scanner, the usable DOF is about 20 nikon LS2000 units (i.e. +/-10),
but the variation of the film position is 30 to 90 units (I.e. +/-15 to +/-
45), so unless I try very hard (use flat film and manual holder), some part
of my images will be out of focus.
Julian
Julian
Canberra, Australia
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