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ASTRO: Experiment in Astrophotography. Ignore that last post



 
 
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Old June 11th 07, 12:40 AM posted to alt.binaries.pictures.astro
George[_1_]
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Default ASTRO: Experiment in Astrophotography. Ignore that last post

Oops. Sorry about that. I will post the images individually. Here's the
first one:

I did some observing with friends last night, and tried out a new set up. I
used the mounting bracket on my 8" newtonian to mount a Canon 300D digital
slr camera and an 500mm 'finder' scope to my german equatorial drive. Using
this set up I shot some wide field images of the milky way from Cygnus to
Saggitarius. The three images below are the best of the bunch I shot last
night.

The lens on that camera is difficult to manually focus at such small focal
lengths (18mm), because it was designed for autofocus. These are compressed
files, so the detail is not as good as the full resolution versions. Also,
that lens appears to have some chromatic aberation (which I guess is not
surprising considering the aperature value used (f3.5). Or it may have been
a dew issue. I'm not sure. Also, when you zoom in on the full resolution
images, it becomes apparent that the images weren't very accurately guided.
I'll have to work on that issue. But they do show more detail than I was
expecting. Anyway, here they are. All of the images are single exposures.
They were taken at 18mm focal length (wide angle), at ASA 800, at an
aperture of f 3.5, and are approximately 2 minute exposures. Yeah, dark,
steady skies for a change. Taken on June 9-10, 2007 at Taylorsville Lake,
Kentucky. The graininess is partly due to the ASA level used at such a
short exposure. I am currently working on stacking the images in order to
increase the number of photons in the images in order to increase the
resolution. If they come out better, I will post those as well. Enjoy,

George




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