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Mike Clemens
Post Laureate
Reged: 11/26/05
Posts: 4286
Loc: Wasilla, Alaska 61N
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Your image is scaled down right?
In regards to the 450D, pixels are smaller and your scope is longer focal length so that image ^ has to be scaled down. This is sensor scale for me ( 0.654" / pixel ) http://www.scopenews.com/astrophotos/galaxies/ngc7331.jpg and if I had used a EOS 450D it would be at .6" / pixel or so, even bigger.
That night I took that was as about as dark as it gets here.
Thanks for your comments I would like to understand also.
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lineman_16735
Tak-o-holic
Reged: 12/04/04
Posts: 2604
Loc: Central PA
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Nice image Mike. Have you stopped using your CCD...ST402? I hope not I really enjoyed the few PN you did last season.
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Chris
A mount from Illinois
A scope from Japan
A camera from Cal-I-Fornia
A dog from Kentucky
A wife and kids from the "Twilight Zone"
The Geek Shed
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Mike Clemens
Post Laureate
Reged: 11/26/05
Posts: 4286
Loc: Wasilla, Alaska 61N
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Hello, yes I have stopped the CCD. (Though my results from it are typically sharper looking than the DSLR.) it is an ST237 by the way, not no fancy new model : )
Here is an update - this is now 27 images of 15 minutes each, run through DDP.
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historius apochromaticus
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KevinUK
Vendor (DSLR-AstroMod)
Reged: 08/22/07
Posts: 720
Loc: N 51'53 W 00'25
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Oh wow Mike , super stuff!
7331 is one of my fav targets, not an easy one for sure, but when those pesky dust lanes start showing through nicey and in detail it sure makes it all the more worthwile! 
Very nice indeed mate!
p.s i added another hours data to my original will be posting it up shortly, much improved, and yes goiing deeper with 10-15min subs is probably the way to go with this baby. 
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Nils_Lars
Post Laureate
Reged: 01/04/08
Posts: 3459
Loc: Santa Cruz Mountains , CA
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Really awesome shot , this latest one is superb.
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Erik
Orion Atlas Self Hypertuned (EQMOD)
Orion ED 80
Williams Optics VII reducer
Celestron 8" SCT
Orion Starshoot Autoguider
PHD guide
Canon 400D Hap Griffin Mod w/Baader filter
Astronomik clip-in LP filter and 12nm Ha
Stilleto CVF and Bahtinov mask
Tamron 75-300mm&28-80mm lenses
NexImage webcam
http://www.flickr.com/photos/31986095@N05/
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xatamec
member
Reged: 09/12/09
Posts: 56
Loc: Catalonia, Spain
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This is an awesome shot! Maybe I miss a bit of color saturation, although that would increase a bit the crominance noise.
Sergi
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My telescopes: WO Megrez 88FD APO and SW 200/1000
My mount: SW EQ6
My cameras: Cooled Canon 350D, QHY5
...and very little time to play with these toys!
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Mike Clemens
Post Laureate
Reged: 11/26/05
Posts: 4286
Loc: Wasilla, Alaska 61N
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Thanks!
Here is 2nd version of all 27 (15) minute frames, this time 1x1 and without DDP.
http://www.pbase.com/mclemens1969/image/118465374/original
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