I bought this to replace my previous Amscope which used USB 2.0 so I could get a higher refresh rate and I'm happy with it. Someone else mentioned that it's not parfocal and the update time is long. Any camera is not parfocal if it is not at the right height. Adjusting the height to be perfectly parfocal takes time and attention. Also, to get the update times listed in the specifications, you must be using a USB 3.0 port on your computer. If you are using USB 2.0, it will be slower than the specification says. It also helps to focus on lower resolutions as they have a higher refresh rate.
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