I bought with the 2.8 lens and was expecting it without distortion. Testing it I got a fish-eye effect that makes it almost useless for conferences. The camera do not hold the 50 fps and drops to 30 fps after some seconds. If you are looking for a camera to use on conferences, I do not recommend this. Product was well packaged and delivery was fast.
There was bad contact between cable and PCBA. After resoldering it start working. In dark there is strange circle area on picture