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Posts Made By: Rick Krejci

May 25, 2006 10:40 PM Forum: CCD Imaging and Processing/Deep Sky

Some Gems in Draco

Posted By Rick Krejci
And the second image here:
http://www.ricksastro.com/DSOs/ngc5905_08.shtml

May 28, 2006 02:57 AM Forum: CCD Imaging and Processing/Deep Sky

IC 5068

Posted By Rick Krejci
Superb image, Vince! I love the processing and it looks like you obtained plenty of signal. Well done!

Rick Krejci

June 20, 2006 01:09 PM Forum: CCD Imaging and Processing/Deep Sky

Narrowband high res M27

Posted By Rick Krejci
Thanks all...this one is one of my all time favorites.

I did M57 last month, but not in OIII...I should try it in narrowband only.

Rick

June 26, 2006 08:12 PM Forum: CCD Imaging and Processing/Deep Sky

IC7050 - The Pelican Nebula - from Utah

Posted By Rick Krejci
Wonderful depth and S/N on this one...pinpoint to the edges.

One observation...When you have so much signal, It becomes more difficult to make decisions on how to allocate it to just 8 bits for display. You chose to bring out several levels of dimmer background variation not normally differentiated in most images. But in order to do that, the main "body" of the pelican is a tad flat....there are many gradations that can be made more dramatic there.

I think you made the right call, since you only have so much dynamic range to work with, and your depth is allocated where many haven't gone before.

Rick Krejci

June 27, 2006 03:38 AM Forum: CCD Imaging and Processing/Deep Sky

A Very Dirty Flower -- NGC7023

Posted By Rick Krejci
Extraordinary!!!

Rick

June 28, 2006 06:06 PM Forum: CCD Imaging and Processing/Deep Sky

Darker Iris...

Posted By Rick Krejci
Thanks for the kind words, all!

Rick

June 28, 2006 07:13 PM Forum: CCD Imaging and Processing/Deep Sky

Bandpass shifts & Ha filters

Posted By Rick Krejci
The wider filters like the Astronomik (13nm) will be just fine...here's their info:
http://www.astronomik.com/english/eng_halpha.html

I used this one with my E160 at f3.3 with great results.
http://www.ricksastro.com/DSOs/rosemosaicSXV.shtml

They have a narrower band version (6nm) and you can specify your focal ratio. But I like the little extra throughput of the wider one and a few extra stars. I never had an issue with the wider bandpass even in full moonlight.

Rick Krejci

July 2, 2006 04:21 AM Forum: CCD Imaging and Processing/Deep Sky

Star Queen/Eagle Nebula

Posted By Rick Krejci
Amazing for such short exposures! Nice detail.

Rick Krejci

July 14, 2006 03:42 PM Forum: CCD Imaging and Processing/Deep Sky

M27's lion's mane

Posted By Rick Krejci
Great, deep image, Tom!

That Astrograph seems to be working well for you!

Rick

July 17, 2006 03:40 PM Forum: CCD Imaging and Processing/Deep Sky

NGC7000 - The Gulf Region in Ha

Posted By Rick Krejci
Great shot, with a great amount of detail!

Did you use flats? It looks like there's a bit of vignetting, which is understandable considering the moon + smoke. Normally, ha allows not using flats, since the sky noise tends to be buried in the read noise.

Rick Krejci

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