The difficulty I have is that I have never worked out what lense size i need in all the 15yrs I've been installing and setting up my own personal security cameras, this is because in the early days I just bought 6mm or 4mm and tried to make them fit. Then I started to purchase varifocal lenses which were more expensive but allowed me to see what I wanted to capture and then zoomed in to close off any areas that I did not require. My property is approx 11m wide and in some cases I have two...
Not sure about lens size based on these factors
Not sure about lens size based on these factors