View Single Post
  #6  
Old 10-08-2019, 06:46 AM
h0ughy's Avatar
h0ughy (David)
Moderator

h0ughy is offline
 
Join Date: Apr 2005
Location: NEWCASTLE NSW Australia
Posts: 33,429
If you look at this wonderful table by Shiraz http://www.iceinspace.com.au/forum/a...e.php?a=217286
You can see that my gain was 80 so reference the 90 line , 30 seconds at f2 is equivalent to 6min at f7, so 13min would be 26 x 6, or 156min at f7 if I can extrapolate that? The sky meter reading there was over 22
Reply With Quote