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Leo Triplet Shootout! ASI071MC-Pro VS QHY247C

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#1 mistateo

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Posted 22 March 2019 - 11:28 PM

Edit: After many conversations here and elsewhere, I have come to the conclusion that my test has too many variables to be a fair comparison between the cameras.  Major flaw #1 was QHY had UVIR-cut filter, ASI had no filter.  Major flaw #2 was the seeing differences between nights.  I averaged .5 arc seconds combined rms error while shooting with ASI, and about .75 arc seconds combined rms error while shooting with QHY.  At 765mm of focal length, the difference in seeing was not trivial.  I intend to do a more scientific comparison next time with single exposures, and without post processing, only calibration w/flats/darks/dark flats, dynamic background extraction and photometric color calibration.

 

Leo Triplet Shootout!  Asi071MC-Pro VS QHY247C....
Both have 3 hours of integration, at 3 minute subs, shot at each camera's respective unity gain, both under 50% moonlight. I tried to process them as identically as possible in pixinsight, not to give any preferential treatment.  Images alternate: QHY-ASI-QHY-ASI etc.

 

Full Disclosure:  Seeing/Guiding was better during the ASI071 capture, but the QHY247C had an IR-cut filter installed while the ASI071MC-Pro did not.  Which explains the color discrepancy, with the red being more dominant in the ASI071MC-Pro image.

 

Hope you enjoy!  Which one do you like better and why?

 

Higher Res Versions Here:

 

QHY247:
https://flic.kr/p/2ebJpQh

 

ASI071:
https://flic.kr/p/24F5Gre

 

Scope: Orion Eon 120mm @765mm FL
Cameras: QHY247C and ASI071MC-Pro
Moon Phase: Half
Integration: 3 hours light frames for each stack, with 3 minute subs. Each has 25 flats, 25 dark flats, and 25 darks respectively.
Stacked in DSS and Processed in Pixinsight

First, the QHY247C:

46722770364_7bfb7a031a_b.jpg

 

 

Next, the ASI071MC-Pro:

40480022663_2ac4feb3a5_b.jpg


Edited by mistateo, 23 March 2019 - 05:50 PM.

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#2 mistateo

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Posted 22 March 2019 - 11:31 PM

M66

 

QHY

QHYCropG1.jpg

ASI

ASICropG1.jpg


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#3 mistateo

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Posted 22 March 2019 - 11:32 PM

M65

QHY

QHYCropG2.jpg

ASI

ASICropG2.jpg


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#4 mistateo

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Posted 22 March 2019 - 11:33 PM

]The Hamburger NGC3628

 

QHY

QHYCropG3.jpg
ASI

Attached Thumbnails

  • ASICropG3.jpg

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#5 zxx

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Posted 22 March 2019 - 11:53 PM

They both look about the same,but i'll give my vote to the QHY,a tad more detail.


Edited by zxx, 22 March 2019 - 11:54 PM.

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#6 44maurer

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Posted 23 March 2019 - 01:56 AM

QHY has less noise, but stars are better color on the ASI.
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#7 ks__observer

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Posted 23 March 2019 - 07:42 AM

The blue seems more dominant in the QHY Hambuger.

Any one of the cropped pics can stand alone as a fabulous photo.

I particularly like the QHY Hamburger.

The QHY colors seem more vibrantant.

You can see some red in QHY M66.

I wonder if it is processing or if it is the camera.

The crop pics show how much resolution is stored in these pics.

Beautiful work.


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#8 scopenitout

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Posted 23 March 2019 - 10:03 AM

The QHY Hamburger is delicious.
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#9 DSO_Viewer

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Posted 23 March 2019 - 11:05 AM

]The Hamburger NGC3628

 

QHY

[attachment=1232633:QHYCropG3.jpg

ASI

attachicon.gif ASICropG3.jpg

They are both very close but I would give the edge to the ASI107 for better color, contrast and for sure sharpness.

 

Steve


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#10 mistateo

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Posted 23 March 2019 - 01:29 PM

Thank you everyone for the comments.  I learned a good bit about these two cameras during the brief experiment.  For my opinion, the ASI wins hands down for full well capacity (star colors).  The QHY wins hands down for cleaner noise profile.  For me the jury is still out on sharpness, but for this quick comparison I think the ASI has the edge.  I need to run a test on the same night with good seeing conditions for a more fair test.  If I were going for maximizing the potential of each camera, I would definitely lower the gain on the QHY camera to prevent clipping so many stars, and I would ensure the ASI had an IR cut filter installed to eliminate the color bias towards the red.  I think for my longer focal lengths, I will use the ASI071, but for shorter focal lengths and faster f ratios and controlling bright stars, I will use the QHY247C.



#11 zxx

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Posted 23 March 2019 - 03:08 PM

After having another look with rested eyes,I agree the ASI wins ,though both look great .



#12 mike8888

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Posted 23 March 2019 - 04:29 PM

Both are great images but I tip my hat to the ASI images. 



#13 elmiko

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Posted 23 March 2019 - 04:58 PM

I will have to go with the QHY image, though they are both awesome, I am partial to the blue hues in galaxies, shows the cold outer arms. I think the stars look a bit tighter with the QHY image also.

Keep up the great work. Mike




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