ASIStudio 1.14 / ASICap 2.14 problem

roW4n9T9

I have just installed ASIStudio 1.14 on a Linux PC and when I run ASICap I'm only getting 11 fps from my ASI120MC-S camera when running at 1920x960 resolution and RAW8 capture. When I reduce the frame size to 640x480 then I get around 60 fps. The PC has USB 3 and when I run AstroDMx Capture on the same machine I get 29 fps at 1920x960 resolution with the same camera.

For comparison I have an older, and much less powerful, laptop ( with USB 2 ) running ASIStudio 1.9.3 / ASICap 2.9.3 and I get the expected 30 fps at 1920x960.

Can you comment on what the problem might be?

roW4n9T9

Some more information. I've been experimenting with the camera SDK and I can replicate the problem by changing the ASI_BANDWIDTHOVERLOAD control value. With it set to its default value of 40 then I get 11 fps at full resolution in my test program. Changing this value to 100 gives me 27 fps. There seems to be no way of changing this value in the ASICap UI?

Tech@ZWO

Hello, the frame rate is related to the exposure time, please check if the exposure time is consistent. Cancel the auto exposure and set the same exposure time manually.

roW4n9T9

I've set the exposure time set to 64us and made sure that the auto is unticked but the problem persists.

Tech@ZWO

Hi, please try adjusting usb broadband percentage here.

roW4n9T9

OK, thanks. That's fixed the problem. Can I suggest:

The default value should be much higher than 40%. Most other software like this uses a minimum of 85%
The "..." control indicated above is not obvious. It should be labelled "More" or something

Thanks for your help