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Re: [OM] Aurora Borealis over Lake Superior

Subject: Re: [OM] Aurora Borealis over Lake Superior
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Mon, 10 Oct 2016 10:56:43 -0400
I issue my own accolades for a superb shot. But I am curious about the choice of f/5.6 on the 24/2.8. With the emphasis on short exposure times opening up another stop would have made a significant difference. The only things that need to be rendered sharp are the stars. Was it your judgement knowing that lens that f/2.8 or f/4 would have introduced visible aberrations into the image?

Chuck Norcutt


On 10/9/2016 11:38 AM, Moose wrote:
On 10/8/2016 9:04 PM, Ken Norton wrote:
http://zone-10.com/d1/node/239

Aurora Borealis over Lake Superior.

Ah, glad you are sharing it more widely. I felt special to get the file,
but frustrated viewing it on my little netbook+ and my ability to
respond promptly and very much to the list is on again - off again as we
travel.

It does look excellent, as far as I can see on this screen, and I look
forward to seeing it at home in three weeks.

Coincidentally, I  received a few days ago from Ctein an Aurora Borealis
shot taken in Yellowknife. Very different looking. I wouldn't choose one
over the other. The higher latitude one does have greater apparent height.

Your approaches to exposure were quite different:

UP - Canon 6D, Olympus OM Zuiko 24/2.8. ISO 6400, 20 seconds, F5.6

Yellowknife - Olympus OMD E-M5mII, 4 sec, f/1.4, ISO 800 with the Leica
12mm f/1.4 ASPH

Roughly the same effective FL, but quite different in exposure choices.
I imagine he had a brighter subject, and, of course, a faster lens that
he had tested to perform well wide open, so could use both lower ISO and
shorter exposure.

Spectral Moose

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