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QHY294M Pro High Gain Mode Problems

QHY294M Pro High Gain Mode Problems
« on: December 22, 2020, 09:56:39 PM »
Hello QHY,

In testing my new QHY294M Pro, along with others, it has been determined that something is wrong with the HGC mode.

Here is the current CN thread with more data:

https://www.cloudynights.com/topic/746170-qhy294pro-clipping-in-high-gain-mode/

A very simple test to repro this, is to take a 1 second image with the cover off with gain at 1599. You will note that the image statistics are 65535 across the board. Now, change the gain to 1600 and repeat the test, you will notice the image statistics are not 65535 across the board. I have attached screenshots of this behavior here so you can see what I mean.

I have the latest SDK, Beta driver package, latest Windows Driver from 12/22, and all of that. I tried different versions of the Windows driver, so that is not likely related to the problem.

Please investigate urgently.

Thanks,
Bill

Re: QHY294M Pro High Gain Mode Problems
« Reply #1 on: December 23, 2020, 04:15:52 PM »
Additional data points that show the problem. These are 20 second exposures in a bright room on my desk. The sensor should be completely saturated, and as you can see, it shows a very strange pattern.


Re: QHY294M Pro High Gain Mode Problems
« Reply #2 on: December 23, 2020, 04:31:53 PM »
I would like to confirm that there is a problem as my 294M behaves exactly as described. Please pay attention as it makes the camera inoperatable at high gain mode.
« Last Edit: December 23, 2020, 05:32:58 PM by HIND »

Re: QHY294M Pro High Gain Mode Problems
« Reply #3 on: December 23, 2020, 07:17:28 PM »

Re: QHY294M Pro High Gain Mode Problems
« Reply #4 on: December 23, 2020, 09:51:13 PM »
Installed both of those, and there was no change in behavior. I rebooted the system and tested again, and still no change in behavior.

This is a widespread problem. All QHY294M-Pro cameras are affected by this. ZWO ASI294MM-Pro cameras are not.

« Last Edit: December 23, 2020, 09:57:34 PM by rockstar »

Re: QHY294M Pro High Gain Mode Problems
« Reply #5 on: December 24, 2020, 04:36:57 AM »
Many people are going to open new 294M-Pro cameras on 12/25 that dont work correctly. Please engage with absolute urgency to resolve.

Re: QHY294M Pro High Gain Mode Problems
« Reply #6 on: December 24, 2020, 07:39:00 PM »
Hi,
    I have reported the test result to Dr.Qiu,we will solve this issue as soon as possible.
Best Regards,
QinXiaoXu

Re: QHY294M Pro High Gain Mode Problems
« Reply #7 on: December 24, 2020, 08:21:09 PM »
Hi,
    I have reported the test result to Dr.Qiu,we will solve this issue as soon as possible.
Best Regards,
QinXiaoXu

Thank you very much! I had a good email exchange with Dr Qiu last night. Whatever the issue is, it does not appear to be related to the anti-amp glow circuit, as the issue still reproduces at 0.08s of exposure. Please let me know if you need more data, testing, or have fixes you would like tested as well.

Merry Christmas!

-Bill

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Re: QHY294M Pro High Gain Mode Problems
« Reply #8 on: December 24, 2020, 09:35:20 PM »
Hello Bill,

         Today I tested this issue and found it should be the anti-amp glow casued. The anti-amp glow circuit will start when exposure > 2sec. So below 2sec it should have this issue but above 2sec you will see this issue.

         This issue is that the pixel saturate level have been changed due to the anti-amp glow operation.  Now we are checking if we can get a better balance between the saturate level and the results of anti-amp glow control.

Best regards,
Qiu Hongyun
Qiu Hongyun

Re: QHY294M Pro High Gain Mode Problems
« Reply #9 on: December 24, 2020, 10:13:28 PM »
Hello Bill,

         Today I tested this issue and found it should be the anti-amp glow casued. The anti-amp glow circuit will start when exposure > 2sec. So below 2sec it should have this issue but above 2sec you will see this issue.

         This issue is that the pixel saturate level have been changed due to the anti-amp glow operation.  Now we are checking if we can get a better balance between the saturate level and the results of anti-amp glow control.

Best regards,
Qiu Hongyun

Hello Qiu,

Merry Christmas.

I tested this just now in SharpCap with the camera facing a very bright light panel. You can see a picture of the setup below.

At 1 seconds in Sharpcap, at 1600 gain in 11MP mode, I cannot get the sensor to saturate completely. At 1599 gain, it does instantly.  This same thing applies to 47MP mode and 200 gain (does not saturate) and 199 gain (does saturate). I had the USB limit set to 0 for these tests as you mentioned.

ZY

Re: QHY294M Pro High Gain Mode Problems
« Reply #10 on: December 27, 2020, 09:11:07 PM »
Hi,

Dr Qiu tell me that today a new driver will be issued which can solve this problem.

Best Regards!
zy

Hello Bill,

         Today I tested this issue and found it should be the anti-amp glow casued. The anti-amp glow circuit will start when exposure > 2sec. So below 2sec it should have this issue but above 2sec you will see this issue.

         This issue is that the pixel saturate level have been changed due to the anti-amp glow operation.  Now we are checking if we can get a better balance between the saturate level and the results of anti-amp glow control.

Best regards,
Qiu Hongyun

Hello Qiu,

Merry Christmas.

I tested this just now in SharpCap with the camera facing a very bright light panel. You can see a picture of the setup below.

At 1 seconds in Sharpcap, at 1600 gain in 11MP mode, I cannot get the sensor to saturate completely. At 1599 gain, it does instantly.  This same thing applies to 47MP mode and 200 gain (does not saturate) and 199 gain (does saturate). I had the USB limit set to 0 for these tests as you mentioned.

Re: QHY294M Pro High Gain Mode Problems
« Reply #11 on: December 27, 2020, 10:09:05 PM »
Dr Qui informed me on Christmas day that QHY would have this resolved today, and I trust him on his word. I really appreciate your work to get this resolved.

Re: QHY294M Pro High Gain Mode Problems
« Reply #12 on: December 28, 2020, 10:02:47 AM »
The new driver appears to resolve this issue! Great work!

Re: QHY294M Pro High Gain Mode Problems
« Reply #13 on: December 28, 2020, 12:51:25 PM »
The new driver appears to resolve almost nothing. The image still can't get saturated at gain 1600 11M and gain 200 47M.
Please take a look at the screenshot. The image was taken at gain=1600, offset=25 in 11 MP mode. This is a 20 sec exposure in a bright room.

This is my 4th camera from qhy and I've never had any issues before but this time I feel myself a beta tester for my own time and money.
« Last Edit: December 28, 2020, 04:29:35 PM by HIND »

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Re: QHY294M Pro High Gain Mode Problems
« Reply #14 on: December 29, 2020, 01:00:19 AM »
The new driver appears to resolve almost nothing. The image still can't get saturated at gain 1600 11M and gain 200 47M.
Please take a look at the screenshot. The image was taken at gain=1600, offset=25 in 11 MP mode. This is a 20 sec exposure in a bright room.

This is my 4th camera from qhy and I've never had any issues before but this time I feel myself a beta tester for my own time and money.


Hello,

      From the image you post I believe the problem is solved. The satuarted level is close to 65000. Before this fixing the satuarted level is just about 30000. Much lower than the satuarted level.

     

Best regards,
Qiu Hongyun
« Last Edit: December 29, 2020, 01:27:42 AM by QiuHY »
Qiu Hongyun