I purchased the following camera from AliExpress last time it was on sale.
https://www.aliexpress.com/item/Outdoor-HD-1080P-10X-Optical-Zoom-AUTO-FOCUS-Varifocal-Network-IP-Camera-SONY-323-4MP-Full/32822492422.html
It says:
Product info:IPD-D41Y00-BS series
Version:V1.04.10-170630
This camera seems to come under a multitude of names.
It has autofocus, but I want to just set focus and LEAVE IT at that focus. The problem is, it keeps re-focussing itself onto the wrong objects when it switches from night to day or back. There are two places you can control the PTZ - in the main "browse" window, there is the PTZ control, and same again in Setting > PTZ Function. I set the focus in either - I even set the focus as a preset, but still, it tries to automatically re-focus on rain, or fog, or a tree.
I have a feeling that if I could find another brand of this same camera, it might have an instruction manual in English!
PS - I put PZ and not PTZ because it doesn't tilt (not meant to).