No .... if you come on with camera awful then there has to be a reason.
calibrating is done on the camera ... it’s done while installing
does zoneminder do 4k yet ?
does it do h265 ?
RTSP ..... I think you will find onvif is the best way
explain why you should defend h264 ? Are you using 4k
Why ..... because you don’t like to hear that your cameras are not compatible with what you using with them.
So your expecting 8mp/4k on equipment that can’t get you there
You will need to load software for cam onto pc
then go into settings .....being on zoneminder I would also drop resolution down to 4mp .... not 8.
Then go into camera zoom and move far out then in and then set it to distance needed then click save