----- Original Message -----
Sent: Wednesday, December 19, 2001 12:01
PM
Subject: Re: [APML] Horsehead and
Pleiades testshots with 6x9 camera/OAG and BRC
In a message dated
12/19/2001 11:13:07 AM Pacific Standard Time, herb@buytelescopes.com writes:
Errr..... what would that calculation be if the CO was 49% not
40% as reported?
Just curious.
The numbers for
49% are as follows:
Airy disc (% of total) = 50%
First diffraction
ring = 34%
all other rings
= 16%
Roland Christen