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Old 03-10-2019, 05:12 PM
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Atmos (Colin)
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Full Moon NGC 253 (recolour balanced)

As I currently only had a OSC camera I've been trying to think of what kind of imaging I wanted to do over the full moon period from my suburban back yard and decided this would be the perfect time to try imaging a galaxy

NGC 253 is large enough and bright enough that I don't think the moon matters too much, I'd say my biggest killer at the moment is shooting with a F/10 (F/4 would make SNR easier) at 0.4"/pixel

Anyway, I'm pretty happy with how the 3.2 hours has come up so far. Ended up with a FWHM of 2" which isn't fantastic by any means but it's the best I've managed with this setup so far. Given how bright the background is even at F/10 I am thinking about dropping my exposure time from 5 min to 2 min, could yield sharper results and I'm still 10-15x read noise.

For pixel peepers

This is about as good as it's going to get until I add another 20 hours of exposure.
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Last edited by Atmos; 05-10-2019 at 02:58 PM.
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Old 03-10-2019, 05:34 PM
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That's a great image Colin - the scope certainly speeds up cooking astro images
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Old 04-10-2019, 10:56 AM
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Originally Posted by Slawomir View Post
That's a great image Colin - the scope certainly speeds up cooking astro images
Thanks Suavi. Imaging with something faster than F/10 would certainly quicken things up a bit more. 0.4Ē/pixel is a bit overkill for my typical seeing which isnít THAT great.
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Old 04-10-2019, 11:11 AM
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That sounds like the perfect circumstances to try high resolution galaxy imaging, Colin ;-)

That's come out very well; nice resolution. How did you decide on the colour?
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Old 04-10-2019, 03:15 PM
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Originally Posted by codemonkey View Post
That sounds like the perfect circumstances to try high resolution galaxy imaging, Colin ;-)

That's come out very well; nice resolution. How did you decide on the colour?
Thanks Lee
Iíve processed this a number of times and used PCC with Average Spiral galaxy and itís always come out the same so I assume itís right. It has a bit more orange and less blue than some others on the Internet though so I might try it as a G2V at some stage.
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Old 04-10-2019, 05:24 PM
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Pretty sure G2V comes out more red than average spiral. Rather than derail your thread, I'm gonna make a separate topic to discuss this further...
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Old 04-10-2019, 10:07 PM
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Great idea under a Full Moon Col ..bloody Moon! ...lucky we only have one! ...very nice result regardless

Mike
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Old 05-10-2019, 02:55 PM
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Originally Posted by codemonkey View Post
Pretty sure G2V comes out more red than average spiral. Rather than derail your thread, I'm gonna make a separate topic to discuss this further...
I did a quick test with G2V and you're right, it's still not even close. I've redone it from scratch and selected the galaxy and ran ColorCalibration but without star detection so it uses the entire Preview as the white balance. I'm much happier with the result.

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Great idea under a Full Moon Col ..bloody Moon! ...lucky we only have one! ...very nice result regardless

Mike
Gotta do something when the moon is out! I should probably just stick to globular clusters though
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Old 05-10-2019, 04:44 PM
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Y'know, I kinda preferred the original, Colin ... I know I called out the colour but I genuinely wasn't meaning to imply it was bad, just different
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Old 05-10-2019, 10:06 PM
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Y'know, I kinda preferred the original, Colin ... I know I called out the colour but I genuinely wasn't meaning to imply it was bad, just different
I don't mind the original but I do prefer the current one personally. I used the Chart 32 as a benchmark for colour matching and although mine has a lot more green noise it's pretty close.
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Old 06-10-2019, 12:45 PM
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Really nice Colin. And to think they discontinued this camera?
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Old 07-10-2019, 04:52 PM
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Really nice Colin. And to think they discontinued this camera?
Thanks Chris.
I believe ZWO had always planned on this camera being a limited edition but QHY still make the QHY367C.
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Old 07-10-2019, 05:13 PM
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Nice work Colin. Glad you managed to re-balance the egg-yolk look out.
That's an impressive image.
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Old 07-10-2019, 06:38 PM
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This is good for full moon imaging and one shot colour Colin. The colour is pleasing and detail is pretty good too.
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Old 07-10-2019, 07:53 PM
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That turned out very well. FWHM of 2 arc seconds in my experience is somewhat rare.

Greg.
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Old 07-10-2019, 09:33 PM
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Quote:
Originally Posted by RobF View Post
Nice work Colin. Glad you managed to re-balance the egg-yolk look out.
That's an impressive image.
Thanks Rob and all.
Iíve definitely learned that Iím better off doing a manual colour balance instead of PPC. I do find PPC does okay with globular clusters though but they are intrinsically redder too.

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This is good for full moon imaging and one shot colour Colin. The colour is pleasing and detail is pretty good too.
Iím pretty happy with it too Paul, Iím thinking brighter objects might be better though. Another boring M42 may be coming when the skies clear again!

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That turned out very well. FWHM of 2 arc seconds in my experience is somewhat rare.

Greg.
Only had a couple of nights with it so far so I am curious to see how the FWHM goes under different conditions.
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