M57 from Paris suburbs

[Dan_Paris]

 

Hello everyone,

here is the first image with my AP900 that I got few weeks ago. There's absolutely nothing to say about the mount, it just works flawlessly from the first to the last sub. The scope is a custom-made carbon 8" f/4 Newtonian astrograph with Romano Zen optics and a 2.5" Wynne corrector.

For this picture I mixed LRGB data with H-alpha data, taken over the last two nights (50% H-alpha in luminance and 40% in red channel, combined in starless mode).

Here is a crop on the nebula and neighbor galaxy enlarged at 125% :

 

The full picture:

Thanks for looking,

 

Dan

 

Technical data :
200/800 custom Newtonian astrograph with Romano Zen optics and carbon fiber tube
TS 2.5" Riccardi-Wynne corrector
ASI183mm + ZWO LRGB filters
Guiding : ZWO OAG + ASI120mm mini + AsiairV1
Luminance : 90 *60sec
Chrominance : 20*60sec each channel
H-alpha : 200*60 sec
Darks, flats and synthetic biases
Conditions : Bortle 7 skies in Paris' suburbs (20km from the Eiffel tower), fair seeing (2" to 2.3" after stacking)
Preprocessing and stacking with Siril, processing with Pixinsight and Rawtherapee

[Dan_Paris]

Here is a stronger processing, what do you prefer ?

 

regards,

 

Dan

[simmo39]

Like the second one a bit more, V nice!

[Paul M]

The second process certainly shows much more detail in the ring without spoiling the image overall. I concur, it's avery nice image!

[Richard_]

Lovely image Dan! To the untrained eye, I think the ring nebula in second image is a bit sharper so I like that one better. 

[Dan_Paris]

Thanks @simmo39,  @Paul M and @Richard_ for your messages, it seems that there is no contest !

[CraigT82]

I agree with the others, though at first glance I thought the second was a bit overcooked, when looking at them side by side the second has more detail and features visible especially in the outer shell. Really nice work! 
 

[Dan_Paris]

Thanks Craig for your message and for the comparison !

With hindsight the second processing is maybe a tad too strong on the ring itself, but clearly better for the outer shell.

 

regards,

 

Dan

Edited July 8, 2022 by Dan_Paris

[Xiga]

Very nice Dan! That's a great M57 you've got there. 

I'm only looking on my phone, but I like the detail of the 2nd version and the colour of the 1st version. Maybe try a simple mix of the two to see how it turns out?

Ps - Love France btw. We're currently on hols just outside Perpignan. Aller France! 🌞🇨🇵

[Dan_Paris]

Thanks Ciarán, regarding the colors it is probably a side effect of the luminance curve manipulation, I could try to adjust the color curves as well. 

 

Enjoy your stay in Perpignan (beautiful region !),

 

Dan

[Knighty2112]

 Nice images. Both are very good. Excellent work! 👍🏻👍🏻👍🏻

[FaB-Bo-Peep]

Wow, amazing! 🙂