On Fri, 29 Jun 2001 05:16:18 -0400 rafeb ([EMAIL PROTECTED]) wrote:
> Temperatures should be lower this weekend,
> so maybe I can check out the "heat" angle.
Heat may affect lubricants and tolerances, of course. Which may impact
resonant behaviour of the mechanism
> The "Super Fine Scan" checkbox worked quite dramatically
> on one image, while I was on the phone with the Nikon
> tech. But the banding still appears occcasionally, on
> other images, even with this option selected.
It was your earlier mention of this which suggested some sort of resonance
related to exposure. A stepper mechanism which carries an LED array and
pauses at each stepping to allow 3 (or 4, with IR) separate exposures is
going to be a tough exercise in precision engineering. Moreover the LED
array is swivelled to a different position for each channel exposure, or
at least that was how the LS1000 did it IIRC. An oscillating mass on the
end of a stepper seems bound to exhibit resonant effects at certain
frequencies, though whether this has any bearing on what you see I have no
idea.
Regards
Tony Sleep
http://www.halftone.co.uk - Online portfolio & exhibit; + film scanner
info & comparisons
