For the best performance and high quality image one must select proper lens. During night if you want a clear and pollution free image use an IR corrected objective lenses. This will avoid a focus shift in the night mode. Without this lens it will appear out of focus.
Here is an image which may be helpful and talks about the focus length.
+ Reply to Thread
Results 1 to 1 of 1
10-03-2013, 03:08 AM #1Junior Member
- Join Date
- Sep 2013
Special lens for network and IP based security