QHYCCD

QHY294M-Pro problem at 47M

QHY294M-Pro problem at 47M
« on: November 24, 2020, 04:51:08 PM »
HI,

The QHY294M-pro are starting to arrive and 2 of us have noticed a problem with the 47M option.
Nothing but darks to see how it works.
With use of Sharpcap.
In 11M it works well (30s, 60, 120, 180, 240 and 360) without worries and an Ampglow well present from especially 240)
But in 47M the poses are not identical with either a wide band of different color if we are in light gray and dark gray or a narrow white band if we are in black and this with the histogram visualization of Siril (Pixinsight gives a similar aspect I did his tests at -10 ? max gain (3624) and exposures of 3s and at 3000 gain and exposures of 30s.
And apparently the 47M would be 10bits and not 12bits.

Best Regards
Dominique Durand
« Last Edit: November 25, 2020, 10:50:56 AM by Dudugaz »

QiuHY

  • *****
  • 5000
    • View Profile
    • Email
Re: QHY294M-Pro problem at 47M
« Reply #1 on: December 31, 2020, 11:32:07 AM »
Hello Dominique ,
        Yesterday we released a new system driver and SDK to solve the following issue:
1.  10bit issue. Now it is 12bit
2.  The image is half satuarted when exposure > 2sec and use the gain >200 in 47mp or the gain >1600 in 11mp.

        You can try the new one and see if it can solve .


Best regards,
Qiu Hongyun
Qiu Hongyun

Re: QHY294M-Pro problem at 47M
« Reply #2 on: January 02, 2021, 11:17:06 AM »
Hello Dominique ,
        Yesterday we released a new system driver and SDK to solve the following issue:
1.  10bit issue. Now it is 12bit
2.  The image is half satuarted when exposure > 2sec and use the gain >200 in 47mp or the gain >1600 in 11mp.

        You can try the new one and see if it can solve .


Best regards,
Qiu Hongyun

Hi Qiu,
Thanks, I got the last drivers, but with the bad weather I only did 11M and 47M darks to see. Here is a summary of the statistics output with Siril for poses made with Sharpcap of 30s 60s and 120s at 1600 Bias 10 gain at -10 ?, the 47Ms seem less problematic to me but the 11Ms let appear more weft and an Amplow apparently more present.
At the bottom of the statistics there are the raw data with the histogram on Siril.
I hope this can be useful, but I personally am not familiar with other analysis tools. I can however transmit brutes with reduced king with specific settings.
Best Regards
Dominique

Re: QHY294M-Pro problem at 47M
« Reply #3 on: January 04, 2021, 08:32:06 AM »
Hi Qiu,

It is nevertheless better and I noticed the same thing with the QHY294c, there is and this in 11M at times on certain exposures an offset on the positioning of the pixels as we see it on this crop of the stack of 25 exposures of 'a dark master. the shift can take place at the beginning of the image or later. On the 120s master dark which I cropped from the middle of the image, the start is not shifted. In 47M I have not yet noticed this problem.

Best regards
Dominique

ma_rs

Re: QHY294M-Pro problem at 47M
« Reply #4 on: January 06, 2021, 07:50:55 PM »
It's a little hard to reproduce the problem, I will try your new settings

Re: QHY294M-Pro problem at 47M
« Reply #5 on: January 07, 2021, 03:33:23 AM »
Thank you and I will continue my discussions here knowing that I have also detected the problem on the QHY294c.
Indeed, it seems random and not easy to reproduce with exposures of 60, 120s I did not detect a case and we see it on 25 exposures of 180s I had 5 consecutive cases and on 25 exposures of 240s it did not. there were only 2 cases. I checked on pixinsight pose after pose in comparison by transparency. I don't know if this is related to the camera (Driver) or to Sharpcap with loss of information when transferring via USB3. On arrival the poses have the same size.
I can communicate the examples, the pose N ? 7, good, and the N ? 8 offset by cropping them to keep only the first part until the offset, knowing that as we see on master-Dark that I joined previously the shift can take place from the start.
Dominique

ma_rs

Re: QHY294M-Pro problem at 47M
« Reply #6 on: January 07, 2021, 07:54:10 PM »
I think I need all your fits files, maybe I can find some clue between the same series

Send them to my@qhyccd.com, if it is too big, try use https://wetransfer.com/

Re: QHY294M-Pro problem at 47M
« Reply #7 on: January 08, 2021, 05:06:29 AM »
Hi,
Fits 7 and 8 file sent by Wetransfer.