The latest version circumvents this problem but requires some user input. MacOS 12 (Monterey) has a design change that causes an exclusive lock on webcams and other UVC cameras after connection which stops AstroDMx Capture from being able to use the interface. In order to reduce the number of split frames, if can beneficial to increase the USB bandwidth setting to maximum. It is not recommended to flash any device from a Windows virtual machine as this could introduce problems that could damage the camera. ![]() It’s important to note that in order to flash the camera, the user will require a Windows computer. If significant split frames are observed, the user should flash the camera with the compatibility firmware which can be downloaded from the ZWO website. However, the compatibility firmware appears to introduce other problems that may render ZWO USB2 cameras difficult to use on macOS. In order to fix this problem, ZWO released a compatibility firmware which changed the maxPacket size back to 512 bytes. ![]() By default, these cameras use a non-standard maxPacket size of 1024 bytes instead of 512 bytes, while this works on Windows computers with an EHCI USB controller, it can be a problem for other operating systems. ![]() When ZWO released its range of USB2 cameras (for example, ASI120MC), they were primarily designed to be used on Windows.
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