DJMcCrady
Carpal Tunnel
Reged: 06/27/03
Posts: 1692
Loc: Seattle, WA
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After three tries I finally got an M45 I'm pretty happy with. It's 21 exposures of 5 minutes each, at ISO 800.
(A higher resolution version is available at http://dandkmccrady.home.comcast.net/images/M45-2005-01-04.jpg.)
Comments always welcome, and thanks!
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++don;
http://starryvistas.net
Tak Sky 90, Tak EM200, STL-4020M
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DaveC
Pooh-Bah
Reged: 11/27/03
Posts: 1316
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nice to have some clear skies eh dj?
sweet shot btw.
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zccopwrx
professor emeritus
Reged: 12/29/03
Posts: 511
Loc: Albany, NY
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Very nice!!!
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Orion ED80
Orion ST80
Celestron C8-N CG5-GT
ToUCam Pro 840K SC1
Canon EOS Rebel
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Anonymous
Unregistered
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Nice shot!! I have been trying to get some of the clouds around the Pleiades as well. I'd like to see what one of your 5 minute shots look like pre-processing...do you mind posting one?
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Benjamin B
Pooh-Bah
Reged: 06/21/04
Posts: 1156
Loc: Sweden
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Very nice
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G11/Gemini
APM TMB 80/480 super apo
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Chris Graham
mmmm...Haggis
Reged: 04/01/04
Posts: 4886
Loc: Stirling, Scotland
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Excellent shot Don.
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-Skywatcher 8" Reflector on HEQ5 with Skyscan
-Orion ED80 Refractor
-70mm Guidescope/grab and go scope
-Canon EOS 350D
-Toucam Pro 2
Astronomy & Veggies
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Jefferson1964
professor emeritus
Reged: 07/15/04
Posts: 570
Loc: Mansfield, Texas
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Very Nice Shot......
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10x70 Binos
Astroscan 2000
8" LX200GPS UHTC
ETX-125EC
ETX-125PE
The ETX Travel Buddies.....
DSIProII DSIPro
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Bill G.
professor emeritus
Reged: 04/04/04
Posts: 544
Loc: Newton, NC USA
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Nice! I believe I'd be "Pretty Happy" with that one too. OK... ecstatic.
Bill G.
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 I took up astronomy because I don't have time for anything else during the day.......
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cometcatcher
member
Reged: 01/04/05
Posts: 74
Loc: Mackay Australia
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I'd be happy with a lot less. Fantastic shot.
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Kevin.
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Matt Russell
sage
Reged: 09/14/04
Posts: 404
Loc: Colorado
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Nice one Don. You can never get tired of seeing images of this object.
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Matt Russell
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Thick_asa_Planck
Dark Sky Hunter
Reged: 09/04/04
Posts: 3342
Loc: UK
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One of the best shots i have seen of this object, i'd be "pretty happy" with this too! 
Alex
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It is often commonplace to leave the notation ambiguous - Anonymous
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zccopwrx
professor emeritus
Reged: 12/29/03
Posts: 511
Loc: Albany, NY
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Reposting...
I still cant get over how nice this image looks!!
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Orion ED80
Orion ST80
Celestron C8-N CG5-GT
ToUCam Pro 840K SC1
Canon EOS Rebel
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TeamGS
Post Laureate
.gif)
Reged: 01/20/04
Posts: 3073
Loc: Elk Grove, CA
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Beautiful shot Don! Very nice nebulosity and color.
I noticed something curious in the fullsize shot: While the nebulosity seems smooth, the stars look pixelated to me. Am I the only one who sees this? Could this just be jpeg compression artifacts?
Regards,
Gary
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Celestron 80ED
Losmandy G11
NexStar 80
Starlight Xpress SXV-H9
SXV guidehead, ToUcam 840
http://www.teamgs.org/astrophotography.htm
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Anonymous
Unregistered
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I just looked at it Gary and noticed the same thing. Squarish pixelated stars. I hadn't noticed it when I was looking at the nebulosity.
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sgjeff2000
super member
Reged: 11/19/04
Posts: 128
Loc: Central Oregon
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I have read that squarish stars can result from resizing the image. The type of resizing can diminish the squarish effect.--Steve
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---Steve
Orion 6" Imaging Reflector
Orion SP130EQ, Orion ST80,
Orion Sirius EQ-G Mount
Orion SSDSI, Meade LPI
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DJMcCrady
Carpal Tunnel
Reged: 06/27/03
Posts: 1692
Loc: Seattle, WA
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Indeed they do look squarish. Thanks for the valuable feedback!
I'm not sure what happened there, I'll have to see if the smoothing caused it, or some other step. Could be JPG compression too. I didn't resize it... that's full-resolution.
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++don;
http://starryvistas.net
Tak Sky 90, Tak EM200, STL-4020M
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DaveC
Pooh-Bah
Reged: 11/27/03
Posts: 1316
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square stars show up more often in systems that are under sampling such as one shot color cameras with short focal length scopes. the bayer matrix interpolation can aggravate this symptom.
not saying this IS what caused it... just one possibility.
another possiblity is the high number of images stacked during alignment will pixel shift misalignments and depending on the software used this can favor horizontal or vertical orientations.
Edited by DaveC (01/06/05 04:51 PM)
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DJMcCrady
Carpal Tunnel
Reged: 06/27/03
Posts: 1692
Loc: Seattle, WA
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The blockiness shows up in the original frames, so I guess it's due to Bayer interpolation.
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++don;
http://starryvistas.net
Tak Sky 90, Tak EM200, STL-4020M
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Charles
Post Laureate
Reged: 06/12/03
Posts: 4111
Loc: Enterprise, AL
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Very nice image Don!
Charles
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