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ebeyonder
Age: 28
Joined: 19 Feb 2005
Posts: 58
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Thanks very much Remus - now I understand!
How does one remove hot and cold pixels though? I can't seem to find instructions in the SSProII manual.
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rcj
Vendor
Age: 34
Joined: 28 Sep 2003
Posts: 1932
Location: Eunos
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| you'll need to use some processing software to remove the hot/cold pixels. IRIS (freeware) could do that. I am currently using CCDSoft for this. You can also do it in Photoshop using the despeckle or dust&scratches filters.
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_________________
Remus a.k.a Photon Bucket
http://www.celestialportraits.com
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ebeyonder
Age: 28
Joined: 19 Feb 2005
Posts: 58
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Thanks Remus. I tried despeckle today.
I also took 2 more pictures today. Nothing great, but I am learning along the way (and I thought the practical setting up was tough - nobody warned me about the processing!):
Comments and suggestions would be greatly appreciated 
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rcj
Vendor
Age: 34
Joined: 28 Sep 2003
Posts: 1932
Location: Eunos
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| thats a good start for the cluster shots! But the black point is set too dark...you might like to bring up the curve (just a general one) adjustment in PS the bring out the midtones in both shots. Now even though they may not contain much midtonality, M45 does have some from the reflection nebulae. Astrophotography is all about understanding image processing nowadays ever since it gone digital, but it's fun! Obtaining raw data (the practical side) is just the tip of the iceberg!
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_________________
Remus a.k.a Photon Bucket
http://www.celestialportraits.com
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ebeyonder
Age: 28
Joined: 19 Feb 2005
Posts: 58
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| Thanks very much Remus! i'll try doing that later... how much exposure time is needed to bring out the reflection nebulae for M45? These shots are about 15 x 1 min exposures.
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rcj
Vendor
Age: 34
Joined: 28 Sep 2003
Posts: 1932
Location: Eunos
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ebeyonder
Age: 28
Joined: 19 Feb 2005
Posts: 58
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I took some pics again tonight after 2 weeks of bad weather here in the US east coast. The pics are slightly smaller because I downloaded them off my FB account, where they had been resized.
M51:
Shot at 2010-03-07
M51, enlarged:
Shot at 2010-03-07
M81, M82:
Shot at 2010-03-07
M81, M82 enlarged:
Shot at 2010-03-07
M37 - not particularly good... among other things, a tree got in the way (and also no light frames):
Shot at 2010-03-07
M45 - finally got the nebulosity to show after 6 min sub-exposures. But forgot to take light frames, so during editing it was hard to tell nebulosity from other defects:
Shot at 2010-03-07
Double cluster - same problem with M37:
Shot at 2010-03-07
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Bergkamp_
Age: 25
Joined: 11 Oct 2003
Posts: 507
Location: Singapore, Choa Chu Kang
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| its pretty good for a start!
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_________________
Wee Ern aRmeD wiF Megrez 90 Doublet APO reAdY tO taKe ovEr thE skY .. wIF jUst mY naKed eYEs .
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weixing
Super Moderator
Age: 37
Joined: 01 Oct 2003
Posts: 4181
Location: (Tampines) Earth of Solar System in Orion Arm of Milky Way Galaxy in Local Group Galaxies Cluster
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| ebeyonder wrote:
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M37 - not particularly good... among other things, a tree got in the way (and also no light frames):
Shot at 2010-03-07
M45 - finally got the nebulosity to show after 6 min sub-exposures. But forgot to take light frames, so during editing it was hard to tell nebulosity from other defects:
Shot at 2010-03-07
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No light frame??? I think you mean no flat frame. Light frame is the frame that contain the actual image and flat frame is the frame that contain information on the optical defects.
Anyway, not bad... especially the M81 and M82 image is quite good. Will try to shoot them, but don't had the chance to do any imaging or observation lately as recent weather condition was very bad... cloudy and very hazy.
Hope weather will improve soon.
Have a nice day.
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_________________
Yang Weixing
 "The universe is composed mainly of hydrogen and ignorance."
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astronoob
Age: 42
Joined: 07 Jan 2010
Posts: 11
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nice!!!!
more pls!!!!! 
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