[filmscanners] Re: rebuild your scanner and get better results

["Major A" <andras@users.sourceforge.net>]

> > They forget to mention that scanning times also increase, and they
> > probably get more noise as well.
>
> Scanning times WON'T increase. All they are changing is the effective
> light source.

I assume that the LEDs have constant intensity (it would be
technically very difficult to make it variable, and wouldn't be of any
advantage anyway). Therefore you have to increase exposure time to
compensate for the loss of intensity by the diffusor -- unless you do
that, you reduce the signal-to-noise ratio. Longer exposure times also
mean longer scan times (unless your data connection to the computer is
the bottleneck).

> It should also be noted that the web pages about this are meant to be
> private and the author has asked them not to be publicised as yet.

Oh!

The tonality argument is rather convincing, so I might do tests with
the LS-30 when I have some time. Note that the film holder is probably
the worst place for the diffusor, the further away from the film it
is, the better. I know already where to place it in the LS-30.

  Andras

===========================================================================
Major Andras
    e-mail: andras@users.sourceforge.net
    www:    http://andras.webhop.org/
===========================================================================

----------------------------------------------------------------------------------------
Unsubscribe by mail to listserver@halftone.co.uk, with 'unsubscribe 
filmscanners'
or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or 
body