I currently have 10 Hikvision IP Cameras, 9 of them have fixed lenses, 2.8mm and 4mm. It's a mixed bag of Tube, Dome, Minidome, 8MP and 4MP versions. One is a 2CD2087G2-LU (2.8mm).
So far 2 Minidomes had to be refocused. Luckily the 2CD2087G2-LU was not affected.