QHY-183M 8-16 bit images
Posted: Thu May 13, 2021 4:45 pm
Hello Robin,
I receive some days ago a new QHY-183M camera .
I test it with SharpCap and I see some strange thing with the camera.
In 8-bit colour space:
The frame per second drops from ~ 6.5 fps at 155 ms exposure to 0.1 fps at 156 ms exposure with the version 3.2.6482-64bit.
The frame per second is stable around 155 ms exposure with the version 4.0.7785-64bit, but not 6.5 fps but only ~ 3.3 fps.
Does somebody already remark this ?
USB traffic = 0, no dropped frame.
In 16-bit colour space:
The saved images are not in 14 bits but only in 12 bits. An overexposed area has a value of 4094 in place of 16384 with both version (3.2 and 4.0).
In addition ... the image is not correct ... it seems that the full columns are shifted by 2 pixels.
I test the camera with the EZCAP and Prism (with ASCOM) softwares, here the results:
First row with EZCAP and last row with Prism, both have 4 columns with dark pixels and the detector ends with useful pixel.
With SharpCap ... only 2 columns on the left and 2 columns on the right with constant values (= 0 in 8 bit and = 2048)
I install the last driver with QHYCCD_Win_AllInOne.21.03.13.17 software.
In addition ... I test first with 4.0.7752.0-64bit and then with the last version 4.0.7785.0-64bit, but why do you "delete" the reticle with the Pixel-Readout ?
Can you have a look ?
The most important is to retrieve the full 14 bit ... If we buy a 14 bit camera, it is sometime good to have the full range.
Regards,
Jean-Francois
I receive some days ago a new QHY-183M camera .
I test it with SharpCap and I see some strange thing with the camera.
In 8-bit colour space:
The frame per second drops from ~ 6.5 fps at 155 ms exposure to 0.1 fps at 156 ms exposure with the version 3.2.6482-64bit.
The frame per second is stable around 155 ms exposure with the version 4.0.7785-64bit, but not 6.5 fps but only ~ 3.3 fps.
Does somebody already remark this ?
USB traffic = 0, no dropped frame.
In 16-bit colour space:
The saved images are not in 14 bits but only in 12 bits. An overexposed area has a value of 4094 in place of 16384 with both version (3.2 and 4.0).
In addition ... the image is not correct ... it seems that the full columns are shifted by 2 pixels.
I test the camera with the EZCAP and Prism (with ASCOM) softwares, here the results:
First row with EZCAP and last row with Prism, both have 4 columns with dark pixels and the detector ends with useful pixel.
With SharpCap ... only 2 columns on the left and 2 columns on the right with constant values (= 0 in 8 bit and = 2048)
I install the last driver with QHYCCD_Win_AllInOne.21.03.13.17 software.
In addition ... I test first with 4.0.7752.0-64bit and then with the last version 4.0.7785.0-64bit, but why do you "delete" the reticle with the Pixel-Readout ?
Can you have a look ?
The most important is to retrieve the full 14 bit ... If we buy a 14 bit camera, it is sometime good to have the full range.
Regards,
Jean-Francois