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My first astro-photo
Posted By: SouthernCross, 01-21-2008, 04:09 AM

M42 - The Great Orion Nebula
22x30sec, ISO800, 3000x2000 RAW aRGB images taken with K100D attached to 8" f5 Newtonian. Stacked and minimally processed with Iris astro imaging software.
This was my very first attempt at astro-imaging with my K100D. I think I nailed it, lucky!
Cheers,
Steve

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01-21-2008, 04:19 AM   #2
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Looks terrific! That must be awe-inspiring, looking through the eyepiece of the telescope. Pardon my ignorance in astrophotography, but why 22 exposures?
01-21-2008, 04:23 AM   #3
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Correct me if I'm wrong, but I think it's to allow enaugh time so that light can paint all those beautifull blasts...
01-21-2008, 04:27 AM   #4
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Wow! That's beautiful! I would love to try something like that. What is an f5 Newtonian?

01-21-2008, 04:40 AM   #5
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QuoteQuote:
What is an f5 Newtonian?
One of these bad boys!



I really your effort Steve, fascinating
01-21-2008, 04:53 AM   #6
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Original Poster
Hi people,
Thanks for your kind words.
G M Fude: multiple exposures work in a similar way as one long exposure, except that you will get a better signal to noise ratio > better pics, more fine detail.
CJCram: My telescope is an 8" or 200mm reflector with a 1000mm focal length, 1000 200 = f5.
Tom: you use your K100D for astro imaging?
Cheers,
Steve
01-21-2008, 05:00 AM   #7
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No sorry i should have said. I know nothing of this type of photography or indeed the telescope (googled the name of it!).

Not to say im not interested though, the picture you have captured is great. Cant wait to see more
01-21-2008, 05:00 AM   #8
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QuoteOriginally posted by thomasjmpark Quote
One of these bad boys!



I really your effort Steve, fascinating
How do you mount a DSLR on this thing???

01-21-2008, 05:01 AM   #9
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Seriously impressive. Love the images from the space. Never attempting this before and would love to read up on that
01-21-2008, 05:05 AM   #10
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QuoteOriginally posted by G M Fude Quote
Looks terrific! That must be awe-inspiring, looking through the eyepiece of the telescope. Pardon my ignorance in astrophotography, but why 22 exposures?
Astro images are often stacks of tens(hundreds, even thousands) of images, because stacking (averaging) allows to reduce noise. Of course one exposure with lower ISO would also have lower noise, but keeping the exposures relatively short allows to minimize the effect of earth rotation (that makes the stars move in the sky). Of course (good) telescopes often have special clockwork to keep them in sync with sky movement, but having shorter exposures never hurts.
And also the view through the eyepiece is often much more boring than the pictures, because human eye is not as sensitive as a decent stack of high ISO images.
Btw. with stacking you can take beautiful astro images even with a decent webcam.
01-21-2008, 05:17 AM   #11
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QuoteQuote:
How do you mount a DSLR on this thing???
Scellotape and blu-tac
01-21-2008, 05:18 AM   #12
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QuoteOriginally posted by thomasjmpark Quote
Scellotape and blu-tac
With or without lense on camera?
01-21-2008, 05:21 AM   #13
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With or without lense on camera?
You got me there! Without i would guess but am probably wrong

btw, when you say 'stacking' images what does that meen exactly? merging?
01-21-2008, 05:25 AM   #14
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QuoteOriginally posted by pentagor Quote
With or without lense on camera?
It's possible both ways.
But without the lens is the far better way.
You need a K-mount to T-ring adapter which is connected to telescope specific eyepiece socket to T-ring adapter. Or something like that. Haven't used it myself, so correct me if I missed very much.
01-21-2008, 05:28 AM   #15
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QuoteOriginally posted by thomasjmpark Quote
btw, when you say 'stacking' images what does that meen exactly? merging?
Calculating the average of the same pixel in every image with the images first precicely aligned using several stars as position markers. Plus a lot of other optimizations depending on software.
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