Re: a Good Idea for taking flats

[Oscar Saa <osaa@ctio.noao.edu>]

Similarly to the good behavior of  ground glass is regular white cloth
... and it does not break as glass ... apply the very same way.

Oscar


Stupendous Man wrote:

>   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. ...