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FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
Thread started 04 Jan 2011 (Tuesday) 19:31
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Orion Nebula C&C

 
rpmaurer
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Jan 04, 2011 19:31 |  #1

560mm f4.0 2sec, 35 exposures at ISO 800, 15 exposures at 1600, 50 total stacked and cropped

is it over processed i can attach the original


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rpmaurer
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Jan 04, 2011 19:38 |  #2

Perhaps a bit better...


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Joe929
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Jan 04, 2011 19:40 |  #3

Unfortunately 2 sec exposures aren't long enough to bring out the details. I am actually shooting Orion at this moment. I came in to warm up a little while the camera snaps away. I am shooting unguided at 2500mm and can only get 30 second exposures without any signs of trailing. Keep at it, I don't consider myself even in the same neighborhood with the experts, I am just sharing what I have discovered so far. I am hoping to get two to three hours worth of exposures tonight. Right now it's clear, although every time I set up, it seems like a short amount of time before the clouds roll in.
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rpmaurer
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Jan 04, 2011 19:50 |  #4

You can get 30 seconds with no trailing? I couldnt evn get 5... im gonna try again soon with 40 captures 2 secs at ISO 1600... and a higher res on the capture


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rpmaurer
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Jan 04, 2011 19:51 |  #5

thank you for the info though! :)


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paul3221
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Jan 04, 2011 20:19 |  #6

rpmaurer wrote in post #11574713 (external link)
You can get 30 seconds with no trailing? I couldnt evn get 5... im gonna try again soon with 40 captures 2 secs at ISO 1600... and a higher res on the capture

I would assume he is referring to using a guided mount, and you are just on a tripod. It makes a big difference. You say that you are shooting at 560mm. The more you zoom, the shorter your exposures have to be before you see movement. Maybe try getting 5 or 6 seconds at 200mm? Realistically getting any real detail from shooting Orion (or any other DSO) is going to be difficult without a guided mount that moves to offset the Earth's rotation.

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Joe929
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Jan 04, 2011 21:18 as a reply to  @ paul3221's post |  #7

Yes, I am using a telescope on a cg-5 mount that has tracking, but no guiding. I have been adjusting the tracking every 15 minutes or so as it moves slightly. My polar alignment may be slightly off as the scope is in sync with M42 (Orion). Some day I'll purchase an autoguider which should allow for exposures of several minutes. This is not a cheap hobby, I've probably spent close to 2k already and that was with saving close to $500 on the scope/mount setup. That also doesn't include the camera setup which almost doubles that figure.

Also, when I wrote an hour ago, I had crystal clear skies, now a heavy band of clouds is rolling through. I may be done for the evening. I will check again in a little while and try to get some more shots. For now, letting the camera cool down, although I doubt that it is getting very warm at 27 degrees.


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04yellowf150
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Jan 05, 2011 00:04 |  #8

ive been shooting orion alot lately oo. I took 70ish images ranging from 4-10seconds at various isos of 3200 and 1600. Im getting better but cant do to much on just a tripod at 55mm lol

what are you using to stack with?


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rpmaurer
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Jan 05, 2011 08:21 |  #9

Im going to post a better image i got last night with 3.2sec exposures at ISO 1600 larger picture size and more exposures


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rpmaurer
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Jan 05, 2011 08:32 |  #10

Hows this one, its not cropped.


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tkerr
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Jan 05, 2011 11:38 |  #11

Unfortunately no matter how many frames you take and stack, 2 seconds isn't nearly enough for any DSO.
If you spend considerable time and effort at polar alignment, i.e. drift method (multiple iterations) you can extend those exposures as much as a few minutes with that mount and a telescope at that focal length. But you have to take the time to get the polar alignment as accurate as you possibly can. Even if you can only extend your exposures to 1 minute, that will make a huge difference.
Additionally, proper balance is very important. Believe it or not you don't want perfect balance for astrophotography. You want to maintain constant resistance on the gears while it is tracking. For that purpose it is best to bias balance to the rear of the telescope and to the east. Only Slightly bias however; too much and you can make it track worse.

Do you have an illuminated Reticle eyepiece? If not, get one! to accurately do any alignment you should have one.

Additionally, Focus will also make a world of difference. It's hard to tell in your images here, but looking at the stars and the nebulae, it looks a little out of focus.


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Joe929
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Jan 05, 2011 15:44 as a reply to  @ tkerr's post |  #12

Hello Tim,
I think that you are mixing rpmaurer and my posts together as he is suing a fixed tripod and I am the one with a scope. I would like to pick your brain for advice, however, rather than jacking his thread, I will start a new one in the "talk" section.
Thanks,
Joe


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tkerr
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Jan 05, 2011 17:28 |  #13

Joe929 wrote in post #11579975 (external link)
Hello Tim,
I think that you are mixing rpmaurer and my posts together as he is suing a fixed tripod and I am the one with a scope. I would like to pick your brain for advice, however, rather than jacking his thread, I will start a new one in the "talk" section.
Thanks,
Joe

Yep, you're right, sorry about that.:oops: Or you could look at it as though I killed two birds with one stone.


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Orion Nebula C&C
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