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  #1  
Old 07-05-2015, 08:54 PM
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Camelopardalis (Dunk)
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Talking My new imaging rig...first sub!

Folks,

I've recently embarked on expanding my imaging capabilities and with the dedicated assistance of another IISer for which I am very grateful, we've finally managed to extract the first reasonable sub out of it

First image is the central 800x800 pixels, the second is the bottom left corner, also 800x800 pixels. It's not going to set the world on fire, as it was a warm night and I'm using an uncooled DSLR at the moment...but baby steps

Barring thermal/DSLR noise, does this show promise or have I wasted time/money?

Cheers,
Dunk
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Old 07-05-2015, 09:25 PM
raymo
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I would love to say well done, or what a load of old rubbish, Dunk, but
since you gave no acquisition details, and I have no idea what your new rig is, I wouldn't know where to start.
cheers raymo
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Old 07-05-2015, 09:45 PM
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rustigsmed (Russell)
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hi dunk,

nice work!

Eta Carina always a good choice for new gear, but i'm with Raymo how about showing the rest of the picture!

Stars look good and of course you're going to have to get accustomed to the software now for stacking and tweaking!

Cheers

Russ
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Old 07-05-2015, 09:55 PM
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that's part of the fun

But yeah Eta Carina is a good target as it's sooooo bright...just about doable before the Moon gets too high.
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Old 07-05-2015, 10:27 PM
glend (Glen)
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We still don't know what the new rig is. I thought it looked a tiny bit out of focus, but have no equipment details.
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Old 07-05-2015, 11:43 PM
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Judging by the extreme close up, I'm guessing it's something like a 12"
f/10 Alvin Clark refractor.
raymo
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Old 08-05-2015, 01:39 AM
glend (Glen)
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And the long glide trailer to carry it in, with a mini-crane to set it up.
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Old 08-05-2015, 07:22 AM
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C8 with an OAG?

Tell us!
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Old 08-05-2015, 08:06 AM
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Camelopardalis (Dunk)
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keep 'em coming guys, guessing is half the fun the equipment is almost irrelevant, I just want to get feedback on whether or not it's a decent test image. All will be revealed

It's possible it was a tiny bit out of focus, but I don't think so. Some of the stars are big, but it was in the area of Eta Carina which has some bright stars and (first clue) it was a 10 minute exposure...
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Old 08-05-2015, 08:30 AM
glend (Glen)
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Well i'd have say it must be fairly small for an area that bright on a ten minute sub. Or a very long focal length. Could be an ED80 but that's pretty short fl for that sub unless it is cropped heavily. Am I getting warm?
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Old 08-05-2015, 08:43 AM
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rustigsmed (Russell)
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Quote:
Originally Posted by Camelopardalis View Post
keep 'em coming guys, guessing is half the fun the equipment is almost irrelevant, I just want to get feedback on whether or not it's a decent test image. All will be revealed

It's possible it was a tiny bit out of focus, but I don't think so. Some of the stars are big, but it was in the area of Eta Carina which has some bright stars and (first clue) it was a 10 minute exposure...
are you going to show the whole image?

10 mins bright area,
slow scope and im' guessing a tight fov?

thinking not a Newt because of the stars and not a refractor because of perhaps potential long focal length. SCT?
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Old 08-05-2015, 11:14 AM
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I'm thinking an 8-11" SCT, possibly with a barlow.
raymo
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Old 08-05-2015, 11:20 AM
clive milne
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No diffraction spikes is another clue.
The fov is small, which implies 100+inch focal length, so that pretty much rules out refractors.
I am guessing it was taken with a Meade ACF or Celestron Edge HD, probably a 10"
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Old 08-05-2015, 11:31 AM
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Of course he could be fooling us, and bought time on a monster scope.
raymo
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Old 08-05-2015, 01:48 PM
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Full image. Raw file loaded, colour balanced (modded 1100D) and scaled to 25% and saved to be small enough to post...no other processing at all.
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Old 08-05-2015, 01:49 PM
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A couple of you have guessed correctly... it's my Celestron Edge HD 8" at f/10, mounted on my EQ6
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Old 08-05-2015, 02:20 PM
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doppler (Rick)
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Quote:
Originally Posted by glend View Post
And the long glide trailer to carry it in, with a mini-crane to set it up.
It could have been a portable scope like this one.
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Old 08-05-2015, 02:36 PM
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Quote:
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It could have been a portable scope like this one.
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Old 08-05-2015, 02:51 PM
glend (Glen)
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That was good entertainment Dunk. Hope more people get involved in this sort of thing. Thanks for the fun.
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Old 08-05-2015, 03:10 PM
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Regarding image brightness, I should add that the image was taken at ISO400, which is substantially lower than my usual favourite...the noise behaviour of my 1100D is very decent as you approach mid single digits, so ISO1600 is very much a signal-to-noise sweet spot.

I can't wait to point this at a nice galaxy and get a set of subs on a cool night
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