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Re: [OM] Aurora Borealis over Lake Superior

Subject: Re: [OM] Aurora Borealis over Lake Superior
From: Mike Gordon via olympus <olympus@xxxxxxxxxxxxxxxxx>
Date: Tue, 11 Oct 2016 16:57:04 -0400
Cc: usher99@xxxxxxx
Nice shot indeed--had commented to AG on FB too.

AG really knows how to coax the max out of the Zuikos.   Some of the astro 
mavens on FM alt lens list have commented and illustrated with posted images  
the tremendous coma on the Z. 24/2.8 at wider apertures, but not so bad at 
F5.6--AG seems to 
have tamed it more with his profiles somehow.  The angle of declination from 
the celestial equator will also determine the max exposure time before the 
stars start to smear--as well as FL of course.  The Samyang 24/1.4 stopped down 
one stop is supposed to be superb for astro with almost zero coma.   Wider 
useable aperture can help reduce exposure time.  One can use Deep sky stacker 
for stars but doubt that would work with aurora.

Mike
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