RE: Grain aliasing and cold cathode

["gary" <gsellani@xxxxxxxxxxxxx>]

Other than LED lighting, the scanners that I've seen use CCFT's or CCFL's,
which stand for Cold Cathode Fluorescent Tube and CCF Lamp.

CCFT technology is no big deal since chips came on the market to drive the
tubes. [CCFT is the typical laptop backlight, hence the market for driver
chips.]

A bit off topic (but at least involving photography) is a multi-CCFT
blacklight for photographing (and discovering) naturally fluorescent rocks.
The tubes and drivers are all off the shelf components, something
unthinkable even 5 years ago. These black light CCFTs are used in money
inspection equipment.

The new money has a special strip in it that glows under black light.
http://www.lazygranch.com/images/jan2002/money.jpg
This is a uranium glass rock under UV:
http://www.lazygranch.com/images/jan2002/lightsoff.jpg
[Test photos done with digital camcorder and bare CCFT.]



> -----Original Message-----
> From: owner-scan@leben.com [mailto:owner-scan@leben.com]On Behalf Of
> byard pidgeon
> Sent: Sunday, March 31, 2002 9:22 PM
> To: scan@leben.com
> Subject: Re: Grain aliasing and cold cathode
>
>
> Art...or anyone else...are there other scanners using cold cathode? What's
> the particular model of the coldlight Canon scanner, and its specs?
>
> I remember when I went from condensors in my enlarger to
> coldlight...what a
> tremendous difference!
> Much less grain, greater tonal range, no such thing as difficult to print
> negs anymore...just beautiful...so if there's a  high res
> coldlight scanner
> that doesn't have any serious drawbacks (like incompatible with
> Macs) I want
> it.
>
> on 03/31/2002 05:42 AM, Arthur Entlich at artistic-1@shaw.ca wrote:
>
>
> > The Nikon uses a lighting method which tends to enhance grain.  It uses
> > an LED light source, while your Canon used cold cathode which is more
> > diffuse, which tends to soften grain.
>
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