That is a little misleading.
Even though there is little improvement per frame if you double the number of
frames (100 vs. 200) you improve your S/N by as much as you do in going from 1
frame to 2 frames.
Bob
----- Original Message -----
From: San Diego Paul
To: SDAA_AISIG@yahoogroups.com
Sent: Thursday, July 02, 2009 12:18 PM
Subject: [SDAA_AISIG] Signal to noise calculations





RE: the point of diminishing returns, where taking more subframes has little
or no value on the SN ratio of the final picture.

Thanks to Rod Wodowski: http://tinyurl.com/mche85

The bottom row is the # of subframes you take, the vertical axis is the
approximate % improvement in S/N by adding ONE more image
to the existing stack.

Very interesting!

--Paul B





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