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Last night I experimented again with Vega to see if image quality could be improved. Not much luck. There was a slight improvement by going to ISO 1600, 1/20 sec, f2, and using the camera shutter timer to avoid manual shake.

To compare see this mornings camera lunar image of Jupiter and near limb Moon which was taken at 1/400 sec, ISO 800, f4, infinite focus while hand holding a 200 mm fixed prime lens. Jupiter shows at 1 minute of arc in diameter and the Moon has a sharp limb. Dim stars are absent. Working out the lunar for 2754 pixels and a 200mm lens multiplier of .0975 moa/px has the error at a respectable -0.5'

Off the shelf digital cameras aren't sensitive enough yet to capture full star fields with high shutter speeds yet but getting there.

Greg Rudzinski

Re: Determining List by Vega DSLR Image
From: Greg Rudzinski
Date: 2013 Aug 30, 09:34 -0700
Vega is captured again last night right on the meridian. Image 007 settings were ISO 800, f2, 2 seconds, infinite focus. Vega shows as a 15 minute of arc blurred disc. Not the best exposure results for measuring star to star distances. Even so a measurement between Vega and HIP 91235 came in at 5* 19.8' which is within 1 minute of arc vs. true distance.

A daylight image is also attached for a better look at the main mast, furler, and rigging.

Greg Rudzinski

Re: Determining List by Vega DSLR Image
From: Greg Rudzinski
Date: 2013 Aug 29, 13:58 -0700
Frank,

Tonight I shall try again using the built in shutter timer to avoid manual operation of the shutter. Vega should then be a symmetrical disc. ISO jumped to 800 and shutter reduced to 1 second should produce a sharper image without ghosts.

Greg Rudzinski
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