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pawinemaker
member
Reged: 08/12/09
Posts: 26
Loc: SW Pennsylvania
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Right now, M33 is in the sweet spot for avoiding field rotation, so I thought I would see how long I could go on the exposure with the CubePro. I did a half hour of 60s exposures, but the subs showed some obvious star trailing, and at the time I did not notice that some thin clouds were also in the way. I backed it down to 30s. The subs showed much better detail than the 60s which was after the clouds had gone away. I was hoping to get an hour on this, but the clouds came in again at the end. I still have not gotten any filters for my filter wheel, having spent all of my money (and some that wasn't mine) on a big reflector.
Some of the subs did not look very good, so I tried to do a second process telling it to throw away 25% of the subs. It did not look any better, so I'm going to go with the original attempt. Having more data to work with certainly gives you more processing options. I fiddled with the luminance curve and the histogram in DSS, probably a little too much. The stars look a bit bloated, but when I reduce the bloating, the small amount of detail in the galaxy becomes even smaller.
Details:
iOptron CubePro
Astro-Telescopes 102mm F/7 achromatic
Orion StarShoot II Monochrome
118 30s subs, 12 30s darks, keep 95% of lights
Stacked in DSS using recommended settings (sigma combine on the lights, median on the darks)
Some day, I'll need to invest some time (and maybe money) in some actual post processing software.
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The surest way to invite bad viewing weather is to order new hardware.
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DaemonGPF
Post Laureate
Reged: 03/22/08
Posts: 3572
Loc: New Mexico
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Quite frankly, considering the conditions you were working in this is actually a stunning image. The effect on the stars is probably chromatic abberation. There are some ways to counter it in post processing. Carboni's actions has a neat little fix, and there are some manual steps to resolve it as well. You captured a ton of detail for 30 second subs, especially with an F/7.0 scope.
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-Josh
http://cleardarksky.com/c/AlbuqNMkey.html
My AP Gallery
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Nils_Lars
Post Laureate
Reged: 01/04/08
Posts: 3434
Loc: Santa Cruz Mountains , CA
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I agree , considering everything this is a great shot.
Your shots will get better if you stick with it.
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Erik
Orion Atlas Self Hypertuned (EQMOD)
Orion ED 80
Williams Optics VII reducer
Celestron 8" SCT
Orion Starshoot Autoguider
PHD guide
Canon 400D Hap Griffin Mod w/Baader filter
Astronomik clip-in LP filter and 12nm Ha
Stilleto CVF and Bahtinov mask
Tamron 75-300mm&28-80mm lenses
NexImage webcam
http://www.flickr.com/photos/31986095@N05/
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Hrundi
Pooh-Bah
Reged: 02/06/08
Posts: 1237
Loc: Estonia
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I'll be honest. I pretty much far far prefer this to any other m33 image I've seen recently.
Maybe part of it is the fact that it's closer to what I see visually with a telescope. Another part is that it actually looks like the galaxy it is, instead of those generally circular clumpy m33 pictures that have a very flattened dynamic range.
In short, I love it.
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