[Moon-net] Fw: Prime focus extention calculation

Walter Crauwels ON4BCB on4bcb at skynet.be
Sat Nov 1 14:51:56 CET 2008


----- Original Message ----- 
From: Walter Crauwels 
To: moon at moonbounce.info 
Cc: moon-net at list-serv.davidv.net 
Sent: Saturday, November 01, 2008 12:04 PM
Subject: Prime focus extention calculation


No this is not about extention of... 
Like we all ever received some spam mail !!! but:

I have an excisting prime focus F/D 0.4 which i would like to
extend to an F/D 0.35
In order not to reinvent "the wheel" ,I was wondering if someone has made an excell sheet to calculate the dimensions of the parabolic with respect to the
excisting dimensions for an F/D of 0.4

Walter
  
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