Apache-Talk @lexa.ru 

Inet-Admins @info.east.ru 

Filmscanners @halftone.co.uk 

Security-alerts @yandex-team.ru 

nginx-ru @sysoev.ru 




      :: Filmscanners
Filmscanners mailing list archive (filmscanners@halftone.co.uk)

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: filmscanners: exposing C41 for scanning ( was gibberish

On Fri, 29 Jun 2001 05:16:18 -0400  rafeb (rafeb@channel1.com) 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 


Tony Sleep
http://www.halftone.co.uk - Online portfolio & exhibit; + film scanner 
info & comparisons


Copyright © Lexa Software, 1996-2009.