Hi, I am going to install a Dahua 5442 camera to keep an eye on my side service entry door on my garage. I have a 3.6 and a 6mm camera to choose from. The door is about 18 ft from the camera location. These pics are shown with the camera heigh at approximately 10 ft from where the subject is standing, although I am going to lower the height closer to 8 ft. This is my second security system I'm installing, but it's been at least 8 years since the last one so I'm trying to relearn things again. Any suggestions appreciated. Thanks.
3.6mm

6 mm

3.6mm

6 mm
