At 24mm I think Ken's exposure could have been up to about 50 seconds
before showing star trails. But that wasn't the goal. The goal was as
short an exposure as possible to capture the detail that was otherwise
flitting about.
Chuck Norcutt
On 10/11/2016 4:57 PM, Mike Gordon via olympus wrote:
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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