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jgraham
Postmaster
Reged: 12/02/04
Posts: 11575
Loc: Dayton, Ohio
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I’ve been using Mizar as a focusing target with my DSI and I thought I’d have a little fun with it. I recently bought a Meade SN6 with UHTC coatings from Meade’s online store and this was also a good opportunity to compare the SN6 with the N6.
The image below was a basic 25x0.5sec exposure with the histogram pretty much maxed out with a range of 0-65,000. I did a little skyglow removal in Photoshop. This shows the SN6 (and the N6) easily splits Mizar and its companion star. Alcor is to the upper left. This is similar to what you see through an eyepiece.
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-John
The best advice on imaging I've ever been given... don't forget to look! 
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jgraham
Postmaster
Reged: 12/02/04
Posts: 11575
Loc: Dayton, Ohio
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This is a 25x15sec exposure taken with the SN6 (6” f/5 Schmidt-Newtonian) with the levels set using the ASIP’s standard deviation function. The levels were further adjusted in Photoshop. This shows the star images remain pretty clean despite a fairly hefty stretch to bring up the fainter stars.
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-John
The best advice on imaging I've ever been given... don't forget to look!
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jgraham
Postmaster
Reged: 12/02/04
Posts: 11575
Loc: Dayton, Ohio
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This is a 25x15sec exposure taken with the N6 (6” f/5 Newtonian) with the levels set using the ASIP’s standard deviation function. The levels were further adjusted in Photoshop. This shows the diffraction spikes coming from the 3-vane spider used to hold the secondary; pretty, but they could be a problem if you’re trying to image something near a bright star. There’s also a slight field difference between the N6 and the SN6 probably resulting from the flatter field of the SN6.
-John
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-John
The best advice on imaging I've ever been given... don't forget to look!
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zjc26138
Loved By All
Reged: 02/24/05
Posts: 6961
Loc: Mingo Junction, Ohio
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Great image.
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TMB130 SS (Currently out of service.  )
Celestron Edge 8"
iEQ45m
Meade 102ED
Stellarvue 80/9D
9/11- Never Forget.
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budguinn
Post Laureate
Reged: 11/24/04
Posts: 4895
Loc: Gold Beach, Or
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John, very nice. I've taken the habit of shooting my last alignment star....I'm already set up and focusing anyway, so why not? I usually do a couple of minutes of shooting so that I can get the star field behind.....I really like the difference in colors in the stars.....such as Vega and Kornephoros.....big difference.
Now, with the SN6, will it always show the interior shadow as well as the spike....from the vanes?
bud guinn
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Warmest regards,
bud guinn
http://www.budguinn.com
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c131frdave
Post Laureate
Reged: 01/17/05
Posts: 4376
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Somebody is having fun! Nice stuff!
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Tak NJP
Various sizes and shapes of formed glass
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jgraham
Postmaster
Reged: 12/02/04
Posts: 11575
Loc: Dayton, Ohio
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Speaking of fun....
The same field... the same telescope (LXD75-SN6) only this time with a Meade LPI. This is 60x10sec exposures aligned and stacked in real-time, dark subtracted, and the histogram left at 0-256. The levels were adjusted and the background processed to reduce thermal noise. The LPI does a respectable job with stellar objects and I can usually reach about 2 magnitudes fainter than I can see visually. It’s also so easy to use it’s a lot of fun to tinker with when I don’t have a lot of time.
-John
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-John
The best advice on imaging I've ever been given... don't forget to look!
Edited by jgraham (07/06/05 09:00 PM)
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Thick_asa_Planck
Dark Sky Hunter
Reged: 09/04/04
Posts: 3342
Loc: UK
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Nice shot John. i really like your double star images, so keep posting them!
Clear Skies
Alex
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It is often commonplace to leave the notation ambiguous - Anonymous
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