Bart van der Wolf wrote:
"scott" wrote in message
news:NfHEc.276$WO5.171@newsfe3-gui...
SNIP
Is it possible to work out the field of view in degrees from
the focal length?

Yes, if you know the sensor size, at infinity focus it's:
ATAN( sensor_size / 2 / focal_length) * 2 = FOV

Thanks for that, and for all the other replies guys. I just need to draw a
few diagrams for myself now to make it a bit clearer!