RE: [APML] OT Medium Format Film Scanners

["R. Scott Ireland" <ireland@gate.net>]

It does not appear that VueScan will solve focus issues with the Sprintscan
120.  Here's a copy of a post from the filmscanners list.  Ed Hamrick is the
author of VueScan.

Scott

website:  http://www.rsiphotos.com/
email:  ireland@gate.net

------------------------------

Date: Wed, 19 Dec 2001 15:45:44 EST
From: EdHamrick@aol.com
Subject: Re: filmscanners: Sprintscan 120 focus/carriers

In a message dated 12/19/2001 3:42:13 PM EST, ilyons@mac.com writes:

> Can't speak or Vuescan focus, never tried that feature but SilverFast for
>  the Polaroid scanners does NOT allow you to pick a focus point.

VueScan doesn't allow you to pick a focus point either.

The SS120 seems to use a fairly sophisticated focus algorithm
that first does a rough sampling of the whole image, and then
a fine focus at some position that it chooses.

VueScan (and Insight and SilverFast) just set a single
bit at the start of the scan to tell the scanner to auto focus
before scanning.

Regards,
Ed Hamrick

------------------------------


> -----Original Message-----
> From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
> Behalf Of Herm
> Sent: Thursday, December 20, 2001 9:55 AM
> To: astro-photo@seds.org
> Subject: Re: [APML] OT Medium Format Film Scanners
>
>
> Vuescan Tony, Vuescan.. the latest versions even allow you to
> choose what spot
> on the negative the scanner will focus on.. or you could do manual focus.
> Autofocus in scanners works by maximizing contrast in a certain
> area of the
> negative, could be a problem with certain astronomical subjects.
>
> "Tony Hallas" <tonyhallas@foothill.net>  wrote:
>
> > After using the Polaroid 120 quite a bit, I have basically
> thrown out the Silverfast... it is a loose cannon when it comes
> to critical focus.
>
> Herm
> Astropics http://home.att.net/~hermperez
>
> --  APML Archives at <http://astro.umsystem.edu/apml/>  ---
>              Unsubscribe at <majordomo@seds.org>


--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>