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 Post Posted: Wed Aug 16, 2017 9:07 pm 
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And here at FITS attached at 1.999 seconds exposure under the same conditions. Flat is normal and symmetrical as it should be.

Attachment:
UV 1.999 sec binx4.jpg
UV 1.999 sec binx4.jpg [ 345.49 KiB | Viewed 335 times ]


Han


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 Post Posted: Thu Aug 17, 2017 1:29 am 
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Hi Han.k,
Is the image in the attachment taken with USB3.0? or USB2.0?
Regards
chad

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 Post Posted: Thu Aug 17, 2017 6:15 am 
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Both images are taken with USB3.0.

I see always gradient with USB2.0. Do you need a USB2.0 image?

Han


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 Post Posted: Thu Aug 17, 2017 8:44 am 
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In USB3.0, the switch time now is 2s. So the difference between 1.99s and 2s is normal。Do you think this switch time 2s is enough? Should I change it to 5s or longer?

In USB2.0, the switch time is 5s, there should be no difference between 1.99s and 2s, except 4.99s and 5s. Is it better if I extend the switch time longer than 5s?
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chad

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 Post Posted: Thu Aug 17, 2017 2:33 pm 
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Hello Chad,
I did an other test and I confirm the switch point for USB2.0 is at 5 seconds and working! Below a screenshot of the gradient at 5 seconds using USB2.0. It is severe, most likely while USB2.0 is not working at optimum speed. With this gradient imaging is not workable. Some pixels are 1.6 seconds longer exposed!

Assuming a gradient of 1% is acceptable, the switch point for USB2.0 should be at 106 seconds. The amp glow is not a problem since dark subtraction will solve it. At 4.99 seconds the gradient by amp glow is at value 378 against an average pixel value of 308, so still minor.

The switch point will be always debatable and depending on the setup of the user. So I think you should allow the user to select one of a number of fixed values E.g. 1, 2, 5, 10, 15, 20, 30 (50, 100?) seconds. Default at 2 seconds. See below a proposed modified menu:

Regards, Han

Menu proposal:
Attachment:
menu proposal.png
menu proposal.png [ 32.54 KiB | Viewed 330 times ]


USB2.0 gradient
Attachment:
cls 5.0 sec, binx4.jpg
cls 5.0 sec, binx4.jpg [ 93.86 KiB | Viewed 330 times ]


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 Post Posted: Fri Aug 18, 2017 8:56 am 
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Hi han.k,
Great ideas!
But it is a great changing for us. So we will have a discussion about this issue.
I will keep you update if any further information。
Best Regards
chad

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 Post Posted: Fri Sep 08, 2017 4:00 am 
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Hi Han.k,

I have good news and bads news , the good news is that I solved the problem.
While the bad news is it only works for the latest product---ASI1600MM Pro, there will be no more gradient issue, for the previsous 1600 cooled cameras,Due to the limitated design of software and hardware design, it does make worse image quality with this method, we decide to only make improvements in our next generation of our driver insted of current version, pelse keep an eye on our latest products and new drivers.

Thanks
chad

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 Post Posted: Sat Sep 30, 2017 8:31 am 
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Hi han,
We decided not to use your method, not because it was not good. It's our current code framework that determines that we can't use this method.
Because this change affects all of our products and causes problems for other products. Also, this change is not a perfect solution, as I said before, the hardware must be changed to solve the problem.
If you really need it, I suggest you contact our customer service after our 1600MC/MM-Pro products come out.
Thanks
chad

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