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Author Topic: NGC 2683 with the ZWO ASI174M  (Read 285 times)

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Offline psjshep

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NGC 2683 with the ZWO ASI174M
« on: 08:56:46, 08 January, 2018 »
another with the ZWO CMOS solar/lunar camera....

NGC 2683, 7 x 300s binned x1, gain 0.

Dark subtracted to take out the amp glow & again, minimal processing in PixInsight (calibrated, stacked, DBE, histogram stretched & a v. slight deconvolution), resized to 1000 wide pixels for here.

2nd pic is the annotated version

Phil
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Offline Nimbus

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Re: NGC 2683 with the ZWO ASI174M
« Reply #1 on: 09:05:19, 08 January, 2018 »
Nice one Phil, I wonder if you try some sharpening on the galaxy I suspect you could tease out some nice detail.  ATB Jim
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Offline psjshep

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Re: NGC 2683 with the ZWO ASI174M
« Reply #2 on: 09:12:54, 08 January, 2018 »
Thanks Jim..

I did do some deconvolution, but when I pushed it more iterations, the stars looked odd... I'll give it another go when I have a bit more time but mask the stars when pushing further...

Phil
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Offline psjshep

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Re: NGC 2683 with the ZWO ASI174M
« Reply #3 on: 09:14:48, 08 January, 2018 »
btw, the seeing wasn't that steady, despite being quite cold (around 1degree)

The astrometry from the image was :
Resolution ........ 0.578 arcsec/px
Rotation .......... -1.540 deg
Focal ............. 2091.03 mm
Pixel size ........ 5.86 um

(Taken with the f8 10" Truss Tube RC)
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Offline Nimbus

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Re: NGC 2683 with the ZWO ASI174M
« Reply #4 on: 09:34:45, 08 January, 2018 »
I was going to suggest a mask so you can concentrate on the galaxy, I look forward to seeing how you get on. Jim
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Offline chris.bailey

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Re: NGC 2683 with the ZWO ASI174M
« Reply #5 on: 10:22:54, 08 January, 2018 »
Interesting. When I "played" with the Altair version I did LOTS of short subs so something like 500 x 30 seconds.

Chris
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Offline psjshep

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Re: NGC 2683 with the ZWO ASI174M
« Reply #6 on: 10:30:01, 08 January, 2018 »
yeah, I did consider it, Chris... but after a quick test, I was amazed at the total lack of noise.... let alone bad pixels (a rough count showed about 5 ! I'm sure there are more, but not that stood out too much) - the two dominating features were a bit of horizontal banding if the gain was pushed and a amp glow in the lower right - dithering/stacking took care of the 1st... and darks took care of the glow.

Interstingly for me, the ASCOM driver for ZWO (I was using Maxim to capture) has a hard limit of 300s on the exposure... & I read somewhere on a ZWO forum a few weeks ago, that they didn't recommend exposures past 900s... not sure which capture software they were talking about...

Phil
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Offline chris.bailey

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Re: NGC 2683 with the ZWO ASI174M
« Reply #7 on: 17:30:06, 08 January, 2018 »
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Offline psjshep

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Re: NGC 2683 with the ZWO ASI174M
« Reply #8 on: 17:32:37, 08 January, 2018 »
They really are quite amazing chips.......

Phil
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