6 replies to this topic

[vdb]

I'm convinced, after years of imaging with QSI683 and SX814, my new king is the QHY 163M

This image needs another 4 to 5x imaging time, but I could not wait to share first LRGB results of this camera,

so yes there is noise, but at 30sec subs for LRGB and a total of 300 subs I was impatient after first night and processed the set anyway. The processing in itself is a feast, just used 100 bias frames, no dark, no flats. Offset was 60 gain 30

I cropped to take care of vignet, but hey the FOV still is acceptable ...

I live in a red zone, and true dark is almost gone so half of the set was taken in astronomical twilight ...

 

Who could ever imaging a camera at a fraction of the cost, producing such results in a short total amount of time, 2.5h ...

 

 

 

 

 

NGC6946 by Yves, on Flickr

[LoveChina61]

Awesome!

 

Mike

[Aenima]

Excellent work, and impressive for the time spent

 

 

Can i ask, what about amp glow?  Was there only a small amount due to very short subs? or was it removed by the bias frames? or something else, like removed by DBE or gradient tool?

 

 (i usually use darks to reduce the amp glow, so am curious about what happens when no darks are used)

 

 

Thanks for any info

 

 

Congrats on a great shot.

Edited by Aenima, 23 May 2017 - 11:57 AM.

[vdb]

Just for fun and to see if there was some IFN, which Kees pointed out to me, is not possible as it is interstellar dust ... an extreem stretch of data, I need to get 5x to see if it's real.

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[vdb]

@Aenima,

this is a crop so if there would be any amp glow it's not in the image, that said there was no visible amp glow in the stack made of 30 sec subs, I only used bias frames to calibrate.

I did some 5 minute subs for a NB image and it had amp glow, and because it was an NB image it was very noticeable as I could stretch very aggressively, there I used a stack of 50 darks, it took care of the amp glow completely ... so yes this camera has amp glow, but it calibrates out.

(most camera's have some kind of amp glow even my ccd ones, not as severe, that is why you calibrate)

 

 

 

/Yves

Edited by vdb, 24 May 2017 - 12:35 AM.

[vdb]

Bit more color on the LP, I live between Antwerp and Brussels, Kontich to be exact,

should by an SQM meter to put this in perspective.

 

Nasa even has a webpage on how terrible the situation is ;-)

https://visibleearth...ew.php?id=83599

 

/Yves

 

 

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[Aenima]

@Aenima,

this is a crop so if there would be any amp glow it's not in the image, that said there was no visible amp glow in the stack made of 30 sec subs, I only used bias frames to calibrate.

I did some 5 minute subs for a NB image and it had amp glow, and because it was an NB image it was very noticeable as I could stretch very aggressively, there I used a stack of 50 darks, it took care of the amp glow completely ... so yes this camera has amp glow, but it calibrates out.

(most camera's have some kind of amp glow even my ccd ones, not as severe, that is why you calibrate)

 

 

 

/Yves

Thank you its good to know the shorter exposures were less affected by Amp glow.

 

I find im liking the 163m more as time goes by.