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stargazer_7000
2008-Feb-11, 07:33 PM
hi guys,

I returned from London astrofest yesterday and brought a new CCD along.
it is a monochromatic Stalight Xpress SXVF H16 - 2024 over 2024 pixel; 7.2 micrometer.

fortunately the night was clear, seeing decent and transparency fairly good enough for some FL...

here is the data:

9" TMB Apo folded apochromatic refractor (the 'big boy'...(-:)
SXVF H16
L: 1x1 bin, 15x9 min; no darks
R,G,B: 2x2 bin, 7x9 min; no darks

image acquisition in astroart 4
preprocessing in maxim, registax, ccd sharp
postprocessing in Ps CS2 and Pix Insight LE
color balance by trial ( i did not want to waste time with a g2v procedure last night, as I had to take all advantage out of that nice conditions...r=1.3 g=1 b=1.1

all images can be found here:

http://www.stargazer-observatory.com/ngc4490.html

I must admit, irregular galaxies are both, most beautiful and fascinating for their star burst acitivity.
I did one last year, when I tested H16:
http://www.stargazer-observatory.com/4449.html

thanks for looking - your comments and suggestions are always appreciated.

regards,
Dietmar

clop
2008-Feb-11, 08:39 PM
Excellent. How do you get your stars to come out so neat and round and small? Is it just good optics or good seeing or a good mount, or is there some specific processing involved?

clop

RickJ
2008-Feb-11, 10:12 PM
Looks like a winner. Color looks same as mine. Unfortunately my seeing wasn't anywhere near yours. Rarely is unfortunately. But after 6 months of nearly perpetual clouds at night I'll take anything.

Rick

Veeger
2008-Feb-12, 03:27 AM
Excellent pics, Deitmar. Very crisp and bright. The details are easy to distinguish.

-Veeger

stargazer_7000
2008-Feb-12, 06:31 AM
...thanks Clop, Rick and Veeger.

Clop, it is a bit of all: good optics, good seeing and processing.
Rick, can you navigate me to your image please?

RickJ
2008-Feb-12, 09:21 AM
...thanks Clop, Rick and Veeger.

Clop, it is a bit of all: good optics, good seeing and processing.
Rick, can you navigate me to your image please?

Clop can see what lousy seeing does to an image. It was about 4" that night. 3.5" is typical. I did have 1.2 for my M92 shot but that's extremely rare. If it's clear the jet stream is usually overhead.

http://www.usenet-replayer.com/cgi/content/framebanner_3?http://www.usenet-replayer.com/4/2/4/2/1178462424.3.jpeg

Rick

clop
2008-Feb-12, 09:36 AM
Clop can see what lousy seeing does to an image. It was about 4" that night. 3.5" is typical. I did have 1.2 for my M92 shot but that's extremely rare. If it's clear the jet stream is usually overhead.

http://www.usenet-replayer.com/cgi/content/framebanner_3?http://www.usenet-replayer.com/4/2/4/2/1178462424.3.jpeg

Rick

I've never had seeing like that. When I look through my C8 all the stars hop and jig about, shining with sharp little rays and dancing from here to there. That's the main reason I prefer to do piggyback photography rather than to image through the telescope.

JAICOA
2008-Feb-13, 09:56 PM
Hi Diets, Very beautiful indeed sharp and tight., nice colors. Congrats on your new camera and a great first light on it also. Looking forward to see more. Clear Skies

stargazer_7000
2008-Feb-13, 10:57 PM
thanks Efrain!!!

friends,

I was a bit unhappy with the core region.
so I reprocessed luminance data to let the core now stand out with
some sutile detail.
also I enhanced colors a bit and applied a bit more deconv...

http://www.stargazer-observatory.com/ngc4490.html

thanks,
Dietmar

winensky
2008-Feb-14, 01:18 PM
Both stunning. I agree there is more detail visible and better colour definition in your second process. This is beautiful work

Kind regards
Matt

stargazer_7000
2008-Feb-15, 07:25 AM
thanks Matt!