Many CCTV systems do not offer high quality pictures because the correct lens has not been specified at the survey stage.
In order to appreciate the role of a lens it is necessary to understand:
Fixed and variable focal lengths
Manual and auto-iris lenses
Depth of field
Back focusing and the role of a zoom lens
Automatic Electronic Shuttering (AES)
IR (Infrared) lenses
If you would like to learn more about this fascinating subject, at the end of this
module we offer you an exclusive 10% discount off our CCTV over IP Networking course.
By completing/passing this course, you will attain the certificate Lenses Explained - Bitesize
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