Re: tn89

["Karen Holland" <karen.holland@xcam.co.uk>]

...following the flat-fielding discussion, has anyone tried creating
flat-fields using the daytime sky by covering the aperture with a screen
made of the appropriate number of layers of white fabric? I am just about to
try this, so would be interested to hear if it is an appropriate method to
use.

Karen Holland


----- Original Message -----
From: "Arne Henden" <aah@nofs.navy.mil>
To: "TASS List" <TASS@listserv.wwa.com>
Sent: Tuesday, December 31, 2002 5:42 PM
Subject: tn89


> Michael and Tom,
>    The main problem with the technical note is the procedure for
> flatfielding.  Here, the data frames were combined to create
> a master sky flat, which was then applied to the data.  Master......