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Posts Made By: Kerry Green

October 15, 2007 04:49 PM Forum: CCD Imaging and Processing/Deep Sky

Lagoon and Trifid

Posted By Kerry Green
After researching my processing techniques, I have determined that at 300mm, f/7.1 is only 2 stops down from full aperature. I think the coma might disappear if I go to f/8. What do you all think?

-KDG

October 15, 2007 04:52 PM Forum: CCD Imaging and Processing/Deep Sky

Lagoon and Trifid widefield

Posted By Kerry Green
That's a nice image Greg! I wish my 30D got good H-alpha response. I'm very tempted to modify it, but I use it for daytime photography as well.

-KDG

October 17, 2007 10:58 PM Forum: CCD Imaging and Processing/Deep Sky

My First M42 ever

Posted By Kerry Green
Thanks,

Subs were 90sec, 60sec, 30sec and 10sec. Unfortunatley until i get my hand controller for the GM-8, thats about as long as I can go without PEC. Better polar alignment might help too. Right now i only use the polar scope. I've not used FITS liberator, These were all JPEGs converted to TIFFs.

October 23, 2007 02:29 AM Forum: CCD Imaging and Processing/Deep Sky

Question Regarding MaximDSLR

Posted By Kerry Green
Here is another example

October 26, 2007 06:04 AM Forum: CCD Imaging and Processing/Deep Sky

Playing with processing, new processes M-33

Posted By Kerry Green
To me this image looks a little green. Your other one had a little less color. I saved your previous image and played with it a bit, mostly for my own practice. When I made an attempt to enhance it, I increased the saturation. The problem with doing that, though, is I also increased background noise. I hope someday to capture images like this. I dont think I'm quite ready to attempt this one yet!Both of them are great and far more than I could do at my stage in this hobby. My preference is your previous post.

-KDG

October 30, 2007 04:42 PM Forum: CCD Imaging and Processing/Deep Sky

M42 processing question

Posted By Kerry Green
The photo was taken with an unmodified Canon 30D through a WO ZS 80ED II. It was my first shot through the 80ED. I had it piggybacked on a C8 and tracking was a GM-8. I did not guide but my polar alignment was spot on. It was kind of windy, so I may have let a bad frame sneak in. This was a stack of seventy thirty second exposures. Sounds like i may have gotten a bad frame in the stack? Also, the setup is a bit on the heavy side, maybe too much for the GM-8, but I had to try the 80ED and this is the only way I have to do that right now.

Thanks for the help and the comments!

-KDG

November 3, 2007 06:28 PM Forum: Beginning Astronomy?

Mounted (Green) Laser Pointers and the Cold

Posted By Kerry Green
Marc,

If you are leaving the lasers constantly on, it will juice out the batteries pretty quick. 30min constant on time is pretty good for a 5mW unit. Lithium Ion will probably not be much better in cold weather. You might try a nickel metal hydride battery though. I'm not too familiar with this chemistry but i believe it has better cold temperature performance than LiIon. The energy density is not as good but they may last longer in the cold. If you really want outstanding cold temperature performance, go with nickel hydrogen. Performance in this chemistry actually improves as temperature drops. Unfortunately, the smallest single cell I am aware of is about 2.5 amp hours in capacity and looks nothing like a AAA cell, and, oh yeah because of the platinum catalyst and space rating, will cost about $10,000. It will last over 20 years though! grin wink grin

November 6, 2007 06:32 AM Forum: CCD Imaging and Processing/Deep Sky

M42 processing question

Posted By Kerry Green
I discovered the problem! As it turns out, the error was in my method for removing the background gradient. This was discovered when I saw the same issue on an M81/M82 photograph which had very carefully selected frames. From now on I will be removing gradients with software other than IRIS. I will post a reprocessed M42 soon!

Thanks for all the help!

-KDG

June 3, 2008 04:29 AM Forum: CCD Imaging and Processing/Deep Sky

Rain Rain Go Away

Posted By Kerry Green
I was surprised I actually captured this!

June 30, 2008 01:44 AM Forum: Equipment Talk

Can I defork Celestron sct 8"

Posted By Kerry Green
I have never personally done it, but I did purchase a C8 on a GM8 mount. Losmandy sells several plates and radius blocks for a variety of SCT's. If I am correct, it is just a matter of unbolting from the forks and bolting on the Losmandy blocks and plate.

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