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John Miele
professor emeritus
Reged: 05/29/05
Posts: 659
Loc: North Alabama
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This is my second and only other image captured at the peach state swamp gaze  . Taken using my SV102ED at f6.95 with a DSI IIc one shot color camera modded with homebuilt TEC. PHD guiding with a ST-80 on an Atlas mount. 11 x 4 min subs. 10 darks no flats or bias frames. Processed in Nebulosity and paint shop pro. Got several of the little background galaxies which was neat. -- John
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C11/Atlas Mount/Denk II BV
SV102ED/AT Voyager
DSI IIc, DSI II Pro
ST-80, Mallincam Hyper Plus B/W Video Camera
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wb9sat
sage
Reged: 06/16/09
Posts: 328
Loc: Eagar, Arizona USA
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Hi John,
Very impressive photo for being your second attempt. All of the stars seem to be somewhat oblong suggesting that you didn't have the alignment just right. I would also suggest getting much more data. Don't be afraid to take ten or twenty minute subs once you have the drift alignment down. One can never get enough data. Using the DSI II color for long exposures will require that you take and combine some darks to get rid of the hot pixels that are so prevelent in the DSI camera...or using bad pixel mapping in Nebulosity. Flats are also a good idea to get rid of visual noise found in the optical train such as dust motes and vignetting caused from light pollution or a bright moon.
Again, nice shot for the second attempt.
Bill
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Bill Logan
Logan Observatory
Eagar, Arizona, USSA
Elevation: 7,400 feet (2,600 meters) ASL
NexStar 11 GPS on Milburn wedge
Permanent steel pier
12' x 12' Roll-off-roof
WO ZS-66ED refractor
Meade DSI Pro II monochrome
Meade DSI II OSC
Orion 7nm Narrowband filters
73 de WB9SAT
[url=http://loganobservatory.shutterfly.com[/url]
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John Miele
professor emeritus
Reged: 05/29/05
Posts: 659
Loc: North Alabama
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Hi Bill,
Thanks for the comments. I actually meant my 2nd image collected at the PSSG. I have shot other images with my DSI IIC before. I'm not sure if it's the alignment or maybe it's a little out of focus and all the stars have a blurred halo of CA to one side. I dearly wanted to get more subs but the clouds shut me down way before I was ready. Wow...10 or 20 minute subs??? That would require up to 200 minutes taking the 10 darks!  So far, these 4 minute subs are the longest I have tried with any resembelance of success. -- john
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C11/Atlas Mount/Denk II BV
SV102ED/AT Voyager
DSI IIc, DSI II Pro
ST-80, Mallincam Hyper Plus B/W Video Camera
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wb9sat
sage
Reged: 06/16/09
Posts: 328
Loc: Eagar, Arizona USA
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John,
You may want to try 5-min subs until you get your alignment perfected. The point I was making is that there's substitute for getting a lot of data. The DSI II color is an excellent camera and will give you suprising images if you get a lot of data. I invite you to take a look at my website link below and look at the Meade DSI images. Most of them were taken with a DSI I and II color through either a WO ZS-66ED or a WO ZS80ED telescope.
You don't need many darks and flats. I use the 25% rule. If you take ten light frames, you only need 2 or three darks. If you take a hundred frames, take 25 darks and 25 flats. Just be sure the dark are the same exposure and temperature of the light frames. Also be sure that the flat frames are no more than 20,000 ADU and don't touch anything in the optical train.
Bill
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Bill Logan
Logan Observatory
Eagar, Arizona, USSA
Elevation: 7,400 feet (2,600 meters) ASL
NexStar 11 GPS on Milburn wedge
Permanent steel pier
12' x 12' Roll-off-roof
WO ZS-66ED refractor
Meade DSI Pro II monochrome
Meade DSI II OSC
Orion 7nm Narrowband filters
73 de WB9SAT
[url=http://loganobservatory.shutterfly.com[/url]
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yock1960
professor emeritus
Reged: 06/22/08
Posts: 979
Loc: SW Ohio, USA
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John,
That's pretty nice for a DSI-IIc. I tried this once and was underwhelmed, of course you have 36mm of aperture more and I'm assuming a darker sky at the 'swamp gaze'. Were you using Envisage? I never liked the star shapes from Envisage; not round even accounting for tracking/alignment issues.
Steve
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LXD75 GEM
Orion Starblast 4.5" Imaging Reflector
William Optics Zenithstar 66 SD APO
Meade DSI II OSC
Meade DSI III OSC
Orion Starshoot Autoguider
Televue Powermate 2.5x
Discovery 6" Dobsonian
Nikon Action Extreme 10x50's
Gallery
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John Miele
professor emeritus
Reged: 05/29/05
Posts: 659
Loc: North Alabama
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The skies were dark, but there was a lot of moisture in the air. Yes, I used envisage. Soon I will switch over to Nebulosity 2.
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C11/Atlas Mount/Denk II BV
SV102ED/AT Voyager
DSI IIc, DSI II Pro
ST-80, Mallincam Hyper Plus B/W Video Camera
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Paul Rix
Post Laureate
Reged: 11/06/04
Posts: 3346
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Very nice image John. I really like NGC7331, there is so much to see both in the galaxy itself and also all the background galaxies in that field of view. More data would certainly help to improve the image but I think you have a really nice result as it stands.
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jgraham
Postmaster
Reged: 12/02/04
Posts: 6758
Loc: Dayton, Ohio
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That turned out nice! NGC7331 has always been a challenge for me and you've captured it and the background galaxies very well.
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-John
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Homebuilt scopes from 4.25-16.5"
Meade LXD75-N6/SN6/SC8, DSX-90, ETX-60BB, ETX-125PE, DS-2130
Orion StarBlast, BinoViewers, Coronado PST
Rebel XT/XTi, DSI Pro (I, II, & III), DSI, LPI, Electronic Eyepiece, Phillips SPC900NC
Tasco 60mm Refractors
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