a Good Idea for taking flats

[Stupendous Man <richmond@a188-l009.rit.edu>]

  A very wise astronomer at Lowell Observatory has just suggested
another way to achieve uniformly illuminated images with high
signal levels:

>      It seems to me as though the way to do flats is by putting a piece of
>      well- and finely-ground glass like a filter in front of the lens and aim
>      the camera at either twilight or the Moon or even a streetlight or just
>      any light that's say 10 meters or more away. ...
 ...
>      The best thing about having a piece of ground glass or translucent
>      milk glass screwed right into the front of the lens is that you can use
>      just about any light source at any distance and at any time 
>      --- none of this getting twilight flats in a hurry at dusk or whatever.

  I'm very glad that wise astronomers read the TASS E-mail lists!
Thanks, O Wise Astronomer!

                                                 Michael Richmond