Re: filmscanners: leveling scanners

[Tony Sleep]

On Thu, 14 Jun 2001 20:59:15 -0700  Sam A. McCandless ([EMAIL PROTECTED]) 
wrote:

>  That worries me 
> because I think I remember reading somewhere that it's important that 
> a scanner sit perfectly flat. 

I don't think filmscanners care, and can't see why they would.

Regards 

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

RE: filmscanners: leveling scanners

[Tim Atherton]

Indeed, most Nikon filmscanners can be used on their side or upright...

Tim A

Re: filmscanners: leveling scanners

[Robert Q Groom]

Tony Sleep wrote:

> On Thu, 14 Jun 2001 20:59:15 -0700  Sam A. McCandless ([EMAIL PROTECTED])
> wrote:
> 
> >  That worries me
> > because I think I remember reading somewhere that it's important that
> > a scanner sit perfectly flat.
> 
> I don't think filmscanners care, and can't see why they would.

After reading Sam's message, I noticed my *problematic* SS4000 wasn't sitting
quite flat, so I chocked it up and aligned it with a spirit level until
it was.
Alas, the red and cyan colour fringing around high contrast edges didn't change
at all. :-(  So at least my filmscanner doesn't care.

regards,
Robert Q Groom

Re: filmscanners: leveling scanners

[Tony Sleep]

On Sun, 17 Jun 2001 11:31:34 +1000  Robert Q Groom 
([EMAIL PROTECTED]) wrote:

> Alas, the red and cyan colour fringing around high contrast edges 
> didn't change
> at all. :-(

This is fairly characteristic of all filmscanners, to a degree at least. 
Have a close look at some of the native resolution samples for different 
scanners at my site. I don't believe it is chromatic aberration of the 
lens system (which would reverse across the frame) but simply 
colour aliasing compounded by perhaps some CCD blooming. 

Regards 

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

Re: filmscanners: leveling scanners

[Lynn Allen]

Robert wrote:

>>the red and cyan colour fringing around high contrast edges
>>didn't change at all.

Tony answered:
>This is fairly characteristic of all filmscanners, to a degree at least.
>Have a close look at some of the native resolution samples for different
>scanners at my site. I don't believe it is chromatic aberration of the
>lens system (which would reverse across the frame) but simply
>colour aliasing compounded by perhaps some CCD blooming.

I'm a bit out of my depth here, scanner-wise, but Robert's problem looks 
much more to me like misregistration, given that the red "bloom" is on one 
side of the black target, and the cyan or blue "bloom" is on the other. I'm 
not at all sure what would cause this to happen, but a simple chromatic 
aberation would not put the red to one side and the blue to the other--it 
would or should put them somewhat equally to all sides or in proximity. This 
would be seen in Harry's experiments with different scanners and the 
pin-prick "stars" (filmscanners, about 3-4 weeks ago).

With all due respect, I think this is something else altogether.

Best regards--LRA


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Re: filmscanners: leveling scanners

[Sam A. McCandless]

This is just a note of thanks to all those who helped me answer, in 
the negative, the question of whether scanners need to be level. From 
the responses both on this list and on the <[EMAIL PROTECTED]> list, it 
seems to be a non-issue.

Sam

Re: filmscanners: leveling scanners

[jimhayes]

Um, I would worry about maintaining six inches open space behind scanner
and, observing that there appear to be a perf pattern of holes on lower
right  toward rear-my mechanical R&D experience says "keep two inches
away from the holes" in case they are for ventilation...

"Sam A. McCandless" wrote:

> This is just a note of thanks to all those who helped me answer, in
> the negative, the question of whether scanners need to be level. From
> the responses both on this list and on the <[EMAIL PROTECTED]> list, it
> seems to be a non-issue.
>
> Sam

--
Jim Hayes

Pixelography: The marriage of silicon and silver.
Images at http://www.jymis.com/~jimhayes