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Re: filmscanners: exposing C41 for scanning ( was gibberish header)

At 07:47 AM 6/29/01 +0100, you wrote:
>On Thu, 28 Jun 2001 07:48:39 -0400 (EDT)  Raphael Bustin 
>(rafeb@channel1.com) wrote:
>> but I wonder about the wisdom 
>> of overexposing C41 film that will be 
>> scanned.
>> In my experience, it's the dense images that 
>> are more likely to stress the scanner into 
>> banding.
><IDLE SPECULATION> This sounds to me like the old (LS30 'jaggies') Nikon 
>stepper-motor foibles in a different guise, perhaps another resonance 
>issue which occurs when exposure is prolonged. Maybe Ed will be able to 
>alter timings in VS, as with the LS30... </IDLE SPECULATION>
>No banding problems here, ever, with a SS4000.

Must admit I'm confused and concerned about the banding 
on the LS-8000 these days.  I'd never noticed it before 
Lawrence Smith's post, a few days back (along with that 
awful JPG that was attached.)  But since then, I've seen 
it a lot more often than I'd care to...

A couple of things have changed over here; for one, it's 
been pretty hot.  For another, I'm scanning mostly 35 mm, 
as opposed to the 645 negatives when I first received 
the scanner.  Temperatures should be lower this weekend, 
so maybe I can check out the "heat" angle.

The effect, when it appears, is usually pretty subtle. 
One thing I notice is that the bands are quite wide and 
quite periodic.  Aside from that, I'm still trying to 
pin down just what causes it.

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.

BTW, I think you're onto something with the theory 
that the Nikon illumination LEDS are not all that 
bright.  I've also noticed (and mentioned) that the 
"noise" made by the scanner mechanism is unusually 
and disturbingly coarse.  I can believe that the 
audible "clicks" emitted by the scanner correspond 
to the visible bands seen on the scans.

rafe b.


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