|
#1
|
|||
|
|||
astro: m95
10x240 seconds
Meade 8" Schmidt-Newtonian Celestron Advanced Series GT Sbig ST2000XCM over-processed with AstroArt and Photoshop Type of object: Galaxy RA (J2000.0): 10h 44m 00.0s Dec (J2000.0): +11° 42' 00" Constellation: Leo Magnitude: 9.7 Surface brightness: 13.5 Size: 7.3'x4.4' Position angle: 13° Object classification: SBb Description: B,L,R,pgmbMN Notes: Leo group -- John N. Gretchen III N5JNG NCS304 http://www.tisd.net/~jng3 |
#2
|
|||
|
|||
astro: m95
that came out pretty nice John
I like the b/w inverted palette one with the labels a lot. you just can't beat the inverted palette to see the details but the color ones are always more aesthetically pleasing. So I agree with your idea of showing it both ways "John N. Gretchen III" wrote in message m... 10x240 seconds Meade 8" Schmidt-Newtonian Celestron Advanced Series GT Sbig ST2000XCM over-processed with AstroArt and Photoshop Type of object: Galaxy RA (J2000.0): 10h 44m 00.0s Dec (J2000.0): +11° 42' 00" Constellation: Leo Magnitude: 9.7 Surface brightness: 13.5 Size: 7.3'x4.4' Position angle: 13° Object classification: SBb Description: B,L,R,pgmbMN Notes: Leo group -- John N. Gretchen III N5JNG NCS304 http://www.tisd.net/~jng3 |
#3
|
|||
|
|||
astro: m95
Thank you Richard! This was my first stack of images taken with this
camera. I learned a few things that will help the next time. Richard Crisp wrote: that came out pretty nice John I like the b/w inverted palette one with the labels a lot. you just can't beat the inverted palette to see the details but the color ones are always more aesthetically pleasing. So I agree with your idea of showing it both ways John N. Gretchen III N5JNG NCS304 http://www.tisd.net/~jng3 |
#4
|
|||
|
|||
astro: m95
John N. Gretchen III wrote: 10x240 seconds Meade 8" Schmidt-Newtonian Celestron Advanced Series GT Sbig ST2000XCM over-processed with AstroArt and Photoshop Type of object: Galaxy RA (J2000.0): 10h 44m 00.0s Dec (J2000.0): +11° 42' 00" Constellation: Leo Magnitude: 9.7 Surface brightness: 13.5 Size: 7.3'x4.4' Position angle: 13° Object classification: SBb Description: B,L,R,pgmbMN Notes: Leo group ------------------------------------------------------------------------ I've wondered about the exposure time of a one shot versus mono with filters. You work at f/4. When I run at f/10 but bin 2x2 with my 9 micron pixels (18 when binned 2x2) it is about the same as running at f/5 as far as exposure is concerned. You are running f/4 but with smaller pixels with slightly higher quantum efficiency. I don't know how dark your skies are. I have a 6.5 limiting zenith magnitude when there's no ice or moon in the way. That was the case when I took this guy using 7x5 minutes for the luminosity and 3x5 for each color. Since then I've found 10 minute subs are better and give less noise over the same time. So I need to redo this but at 1:20 or nearly double your 40 minutes it appears the time penalty for mono isn't as great as I thought it was. The core of this guy is very interesting if you process it separately then combine the two you can bring out the three parts to it. Two are connected by a blue arc. http://www.usenet-replayer.com/cgi/c...6100237.4.jpeg I see replayer has died as it hasn't picked up anything new since Jan 5 when George put up the Google Earth shots of Kopernik. It appears color processing with your new camera is far easier than it was with your old one. Is that the case? Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#5
|
|||
|
|||
astro: m95
This data can be processed better as I learned a few things along the
way that will help next time. The sky conditions the night of this shot were high clouds but still better than mag7. The data produce by this camera is going to make better images than my old mx5c with less work. Faster?, deciding when to stop processing is the real question. Rick Johnson wrote: John N. Gretchen III wrote: 10x240 seconds Meade 8" Schmidt-Newtonian Celestron Advanced Series GT Sbig ST2000XCM over-processed with AstroArt and Photoshop Type of object: Galaxy RA (J2000.0): 10h 44m 00.0s Dec (J2000.0): +11° 42' 00" Constellation: Leo Magnitude: 9.7 Surface brightness: 13.5 Size: 7.3'x4.4' Position angle: 13° Object classification: SBb Description: B,L,R,pgmbMN Notes: Leo group ------------------------------------------------------------------------ I've wondered about the exposure time of a one shot versus mono with filters. You work at f/4. When I run at f/10 but bin 2x2 with my 9 micron pixels (18 when binned 2x2) it is about the same as running at f/5 as far as exposure is concerned. You are running f/4 but with smaller pixels with slightly higher quantum efficiency. I don't know how dark your skies are. I have a 6.5 limiting zenith magnitude when there's no ice or moon in the way. That was the case when I took this guy using 7x5 minutes for the luminosity and 3x5 for each color. Since then I've found 10 minute subs are better and give less noise over the same time. So I need to redo this but at 1:20 or nearly double your 40 minutes it appears the time penalty for mono isn't as great as I thought it was. The core of this guy is very interesting if you process it separately then combine the two you can bring out the three parts to it. Two are connected by a blue arc. http://www.usenet-replayer.com/cgi/c...6100237.4.jpeg I see replayer has died as it hasn't picked up anything new since Jan 5 when George put up the Google Earth shots of Kopernik. It appears color processing with your new camera is far easier than it was with your old one. Is that the case? Rick -- John N. Gretchen III N5JNG NCS304 http://www.tisd.net/~jng3 |
#6
|
|||
|
|||
astro: m95
"John N. Gretchen III" wrote Isn't this one of those 'springtime galaxies'? Great view John. Too bad Alan Chen doesn't post here anymore. I attended his presentation on one-shot color imaging at last year's Cherry Springs Star Party and he almost had me "convinced" it is better than mono & filters....... George N |
#7
|
|||
|
|||
astro: m95
Thanks George!
George Normandin wrote: "John N. Gretchen III" wrote Isn't this one of those 'springtime galaxies'? Great view John. Too bad Alan Chen doesn't post here anymore. I attended his presentation on one-shot color imaging at last year's Cherry Springs Star Party and he almost had me "convinced" it is better than mono & filters....... George N -- John N. Gretchen III N5JNG NCS304 http://www.tisd.net/~jng3 |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) | [email protected] | Astronomy Misc | 0 | May 3rd 06 12:33 PM |
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) | [email protected] | SETI | 0 | October 6th 05 02:34 AM |
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) | [email protected] | Astronomy Misc | 0 | October 6th 05 02:34 AM |
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) | [email protected] | Astronomy Misc | 0 | September 30th 04 02:23 AM |
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) | [email protected] | SETI | 0 | September 30th 04 02:23 AM |