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View Full Version : Cna someone help calculate the viewing angle for this lens?

olpeculiar
02-16-2009, 02:37 PM
I am looking at a digital surveillance camera with the following lens specifications:

Lens Type: CS mount, f=6.0 mm, F1.8, Fixed

Is this enough information to calculate the angular field of view for this camera? If so, what would the angular field of view be? I found one calculator online, but it gave me a diagonal angular field of 148°, which seems ridiculously wide for a surveillance camera. I mean, wide viewing angles are good, but the fisheye distortion would be so bad you wouldn't be able to make out anything.

Can anybody help with this? (Use small words, I don't know much about photography and lenses and such...) Thanks!

- OlPeculiar

beowulff
02-16-2009, 05:23 PM
You need to know the sensor size.

Jaglavak
02-17-2009, 02:20 AM
http://en.wikipedia.org/wiki/Field_of_view

The "FOV formula"

{o / d} = {i / f}

where:

* f is the film distance (from lens to film plane). When the lens is focussed to infinity, this distance is equal to the effective focal length of the lens. Treating f as equal to the focal length is adequate for most purposes.