M48/NGC 2548 - Great seeing but poor transparency

Chris L Peterson wrote:

On Fri, 23 Feb 2007 20:35:48 +0000, Pete Lawrence
wrote:


I used to believe this too Chris. Unfortunately it's not as reliable
as you would think...


Well, that just goes to show that this rule is variable with location
both for visual and imaging. Certainly, at my site, the degree of
twinkling correlates almost perfectly with long-exposure FWHM.

I also use twinkling as a gauge and which I have found to be accurate as
well (for imaging).

Anthony.