The IN-9008 Full HD and IN-9408 2K+ are available from the factory with a 4.3 mm wide angle lens (approx. 90° viewing angle), however, if you place a greater emphasis on more details in the picture or monitors an object which is a little further away, you should use a slightly smaller viewing angle to get more details. The 16 mm lens offers you a viewing angle of approx. 25°
The lens is very easy to replace itself, so the existing lens is turned out and the new lens is screwed in until the image is sharp.
Thanks to the very simple conversion, this can be done by every customer to themselves.