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Another Needle Galaxy

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#1 mackiedlm

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Posted 17 April 2021 - 07:22 AM

This is my effort at the needle. This was an experiment after I had read that some modern refractor FF/FR's will actually produce reasonable results on SCT's. My previous images, with the Meade 4000 0.63 FF/FR had horrendous coma - u-shape stars pointing towards centre and required tight crop to get rid of the worst. Even at that the coma was still obvious. So I put my SW 0.85 FF/FR on and gave it a go. Remarkably the coma is almost entirely gone. This is just a moderate crop for framing but even on full images the stars in the corners are greatly improved. I think a little additional back-sapce with make them even better. With the 0.85 it should be giving me 1700mm FL but on platesolving its coming out at 1976? -

 

The stars and the image as a whole are still far from perfect but all things considered I think this it is an interesting result - considering the usual thinking that for an SCT it is essential to use a dedicated FF/FR and copared to my previous actual results.

 

8" LX200GPS, (on a wedge) SW 0.85 FF/FR, ASI2600mc. 120  x 120s bin 2x2.

 

 

Needle_1700_final_s.jpg

 

Full res is here

get.jpg?insecure

 

 

 


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#2 Dynan

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Posted 17 April 2021 - 07:39 AM

Outstanding!


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#3 wizbang396

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Posted 17 April 2021 - 07:46 AM

You can make those stars ROUND in Photoshop or Nebulosity4.


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#4 Mert

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Posted 17 April 2021 - 07:54 AM

Fabulous, now you did it!
It's on my ever growing todo list
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#5 petert913

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Posted 17 April 2021 - 09:02 AM

The dust cloud detail in the equatorial belt of the Needle is spectacular !


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#6 elmiko

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Posted 17 April 2021 - 09:13 AM

Lovely image! Great guiding!


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#7 mackiedlm

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Posted 17 April 2021 - 07:00 PM

Thanks for the kind comments everyone.




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