[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: tn89

Tom mentioned that you need to cut the brightness down by lots.
In addition, daytime flats can suffer from light leaks.  It is
better to perform the same diffuser experiment at twilight.
Arne

Karen Holland wrote:
> ...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......
> 
> 
> 
> 
>