Re: Good Board Stack

["Thomas Droege" <tdroege2@earthlink.net>]

I have never seen a "dust donut" on a Mark IV camera.  Has anyone else?  I
think they are just out of our range.  Either in the noise or out of the
optical range.  I don't know about the "and such".  As I say the big change
is the lighting in the neighborhood over which I have no control.  I can
see these effects.

Tom Droege


> [Original Message]
> From: Michael Koppelman <lolife@bitstream.net>
> To: <tdroege2@earthlink.net>
> Cc: tass <tass@listserv.wwa.com>
> Date: 1/28/2004 10:29:32 AM
> Subject: Re: Good Board Stack
>
> Dust donuts and such can change on a night-to-night basis. Some parts 
> can flex or shift. I don't think your approach is probably bad, but I 
> think the thinking is that your flat should happen as near as possible 
> to your exposures for the above (and other) reasons.
>
> Michael Koppelman
>
> On Jan 28, 2004, at 10:20 AM, Thomas Droege wrote:
>
> > So
> > why even try to do them every night?  The only reason that I can think 
> > is
> > that "every one does them" so I will be criticized if I don't.  But 
> > they
> > are useless.  Comments, anyone?