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FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
Thread started 01 Jun 2009 (Monday) 18:41
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M101 with AT8RC

 
strgazr27
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Jun 01, 2009 18:41 |  #1

I had my wife roll the roof back on the observatory and I managed to grab 400 minutes of M101. The skies weren't great but this is THE best shot I have ever taken of this object. It's both tough to shoot and process. I'm going to rework it again tonight as it's a little noisy. Comments welcomed :)

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Gripped 40D - 17-40L - 70-200 f/4L - Gitzo GT0531 Mountaineer - Astrotrac TT320X-AG
www.strgazr27.zenfolio​.com (external link)

http://www.stonyhillob​servatory.com (external link)

  
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A.S.I.G.N. ­ Observatory
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Jun 01, 2009 19:43 |  #2

I wouldn't knock yourself so hard mate. That's a great image. Maybe a touch on the green side (very slight).

Lovely and sharp. Tracking is spot on. Nice round stars.

Baz.


Builds By Baz website http://www.buildsbybaz​.com (external link)

  
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Celestron
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Jun 01, 2009 21:42 |  #3

Fantastic shot strgazr27 ! Beautifully done !




  
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chris.bailey
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Jun 02, 2009 01:50 |  #4

Agreed. Cracking image.




  
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Adrena1in
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Jun 02, 2009 10:06 |  #5

Crikey, that's very impressive.


Canon EOS 450D, Sigma 18-200mm, Canon 50mm f/2.5 Macro, 2x TC, Revelation 12" f/5 Dobsonian, Mintron PD2285-EX webcam.

  
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joaquimsrs
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Jun 02, 2009 17:45 as a reply to  @ Adrena1in's post |  #6

Hi,

I'm sorry but I have a really newbie question. How is it possible you took 400 mins of this galaxy? I mean doesn't the galaxy move on the sky? How do you manage to rotate the telescope? And how many photos did you take? Why did you need to take so many photos? Wouldn't 1 long exposure photo be enough?
I know that this may be a real dummy question, but I really would like to understand.

Thanks

JS


Joaquim Soares
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jmx
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Jun 03, 2009 04:52 |  #7

joaquimsrs wrote in post #8037791 (external link)
Hi,

I'm sorry but I have a really newbie question. How is it possible you took 400 mins of this galaxy? I mean doesn't the galaxy move on the sky? How do you manage to rotate the telescope? And how many photos did you take? Why did you need to take so many photos? Wouldn't 1 long exposure photo be enough?
I know that this may be a real dummy question, but I really would like to understand.

Thanks

JS

To counter the rotation, you use an equatorial mount. See cloudynights.com's forums for discussions of this. You can also see my thread posted on this forum yesterday with my first galaxy shots, and I list the exact equipment I used (which is pretty much the cheapest setup available).

1 400 minute exposure would be nearly impossible due to satellites streaking through your photo, planes, or imperfections in how the equatorial mount tracks (things still drift slightly over time and have slight errors), not to mention the noise you'd get in 400 minutes! By taking 100 4 minute shots, you get the same amount of photons, but you have 100 samples of random noise. You can then average the 100 shots together (its called "stacking"), the noise turns to a paternless low signal, which you can edit out easily in photoshop, and everything else is pure signal....ie, the galaxy. The other upshot is if a plane flies through your shot, you only ruined 4 minutes of exposure, not 400!

cloudynights.com's forums are where I picked up all the info to shoot my first shots, there's a DSLR specific sub group on there with good info.


http://jmx.ls1howto.co​m (external link)Beginner astro shots w/50D
Scopes: 6" Newtonian (750mm f/5), Skywatcher Equinox 80 (500mm f/6.25), AT 8" Newtonian (800mm f/4).
Old astrophoto setup for sale (SoCal only): http://jmx.ls1howto.co​m/forsale/index.html (external link)

  
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joaquimsrs
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Jun 03, 2009 06:33 as a reply to  @ jmx's post |  #8

Thanks jmx. I got it now. will check the link as well.

Cheers


Joaquim Soares
_______________
EOS-5D MKII + EOS-40D Gripped
EF-S 10-22mm f/3.5-4.5 | EF 50mm f/1.8 II | EF 85mm f/1.8 | EF 16-35mm f/2.8L | EF 24-105mm f/4.0 L IS | EF 70-200mm f/2.8L |SIGMA 50-500mm f/4-6.3 EX DG

  
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MidnightSun
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Jun 03, 2009 17:26 |  #9

Very nice shot.!!..perhaps a tad green, but I'd be happy with it. Just something to fool with on a cloudy night....:D


Dave
Canon 350D, AE-1, Orion 8" Newt. f/4.9; EQ6 w/ modified motor drive; Orion 70mm f/10 Refractor Guide Scope; Celestron NexImage CCD Imager; Starshoot Autoguider. Orion Electronic Focusers.
Astro Setup / Midnight Sun Astrophotography (external link)

  
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Sky ­ Hye
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186 posts
Joined May 2009
     
Jun 05, 2009 17:28 |  #10

I know many of you are seasoned Astrophotographers with years of experience under your belts.

Can any of you direct me towards some resources on taking photographs like these, (obviously not with an observatory). I'm lookin gat maybe a 6-8" SGT scope and already have a canon 500D. Any help would be much appreciated.




  
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jmx
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Location: Los Angeles Area
     
Jun 05, 2009 17:30 |  #11

cloudynights.com


http://jmx.ls1howto.co​m (external link)Beginner astro shots w/50D
Scopes: 6" Newtonian (750mm f/5), Skywatcher Equinox 80 (500mm f/6.25), AT 8" Newtonian (800mm f/4).
Old astrophoto setup for sale (SoCal only): http://jmx.ls1howto.co​m/forsale/index.html (external link)

  
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Celestron
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Jun 05, 2009 22:32 |  #12

Jerry Lodriguss (external link)
The Digital Camera Astronomical Imaging FAQ (external link)




  
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Sky ­ Hye
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Jun 05, 2009 23:03 |  #13

Thanks Celestron, looks like alot of learning to do! Can anyone recommend a good scope to begin with for some galaxy viewing?




  
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chris.bailey
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Location: Norwich, Norfolk, UK
     
Jun 06, 2009 02:31 |  #14

Sky Hye wrote in post #8058744 (external link)
Thanks Celestron, looks like alot of learning to do! Can anyone recommend a good scope to begin with for some galaxy viewing?

https://photography-on-the.net/forum/forumdis​play.php?f=126 has been discussed lots of times with pretty consistent advice I think




  
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M101 with AT8RC
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