face cover prys off easiiy with a small screwdriver in the 'slot' at the bottom.
Lens can be easily replaced as well. Look for an M16 for 1/1.8" sensor. I put a 6mm into mine for a much more useful FOV, imo.
one of these: (they also have 4mm)
US $10.35 |6mm 1/1.8
still searching for Dahua Firmware that works on these...
and yes, it CAN be mounted and used in corridor mode (sideways, for taller, narrower FOV) BUT NOT AT 4k (8mp) resolution, for some reason.
The 'Flip 90/270 degrees' setting in the 'Picture' config page only allows it in 1080P and lower. That's a bit of a bummer, but i can readily have BI rotate it...
That said, I don't see why
@sphinx_888 's image would be a problem. Yes, it can be wall mounted and still level in in normal (non-corridor) mode. Just a matter of rotating the camera on the mount.