M20 Trifid Nebula

CCD vs Film? Lots of time vs no patience? Alright, this is your place to discuss all the astrophotography what's and what's not. You can discuss about techniques, accessories, cameras, whatever....just make sure you also post some nice photos here too!
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cataclysm
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Post by cataclysm »

Nice Weixing! Lots of colours!
I image the same object yesterday too. Will post later.
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weixing
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Favourite scope: Vixen R200SS & Celestron 6" F5 Achro Refractor
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Post by weixing »

Hi,
only coma corrector and no other filters?
Yes... only coma corrector and no other filter was used, so this is basically the image of M20 at visible light. Also, I don't have an unmodified DSLR and I don't intend to modify my DSLR at the moment as I also use it for normal photography.
Nice Weixing! Lots of colours!
I image the same object yesterday too. Will post later.
Great! Did you image with the Ha filter?? Would like to see the Ha version. :D

Have a nice day.
Yang Weixing
:mrgreen: "The universe is composed mainly of hydrogen and ignorance." :mrgreen:
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chrisyeo
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Post by chrisyeo »

Hi Weixing,

Gulp! That's really nice! Hard to believe that it is taken in Singapore.

Do you have a full res version uploaded?
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amin7074
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Post by amin7074 »

fantastic Weixing........ :shock: :shock: :shock: .
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weixing
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Post by weixing »

Hi,
Do you have a full res version uploaded?
No. Will look out for free gallery hosting website... :P

Have a nice day.
Yang Weixing
:mrgreen: "The universe is composed mainly of hydrogen and ignorance." :mrgreen:
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Clifford60
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Post by Clifford60 »

Great shot, yes hard to believe that it is taken in light polluted S'pore. Great job Weixing.
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Traveler
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Post by Traveler »

Lovely colours and diffraction spikes!
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cataclysm
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Post by cataclysm »

Here is my version. I tried to image this on the Mewlon to yield a larger image scale. Even with the help of the reducer, at F9.3 the Mewlon is way to slow, loosing a lot of light along the way. The camera failed to capture the blue blue region where I think the modified camera has no advantage.
The captured data are as follow: 28x140s colour exposures at ISO800 & 18x270s HA exposures at ISO800.

Image
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weixing
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Post by weixing »

Hi,
The camera failed to capture the blue blue region where I think the modified camera has no advantage.
Hmm... I take a look at my image, the blue channel and green channel are the strongest. A modified camera shouldn't affect the blue channel... May be you are too aggressive with your processing??

Have a nice day.
Yang Weixing
:mrgreen: "The universe is composed mainly of hydrogen and ignorance." :mrgreen:
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VinSnr
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Post by VinSnr »

The reason why cataclysm's photo is poor in blue is simple. Because his H-alpha photos (which doesn't have blue and green spectrum) have exposure that is longer that his colour photos. So when you stack them together, you see very poor blue.

If he stack only his colour photos, I bet he will see all the blue and green.
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