Caveat: Paul's equations work for 35mm format only.
In the first equation, the 21.7mm is half the diagonal of a 35mm film
frame. For other film formats, replace the "21.7mm" with half the frame
diagonal for that format, in millimeters.
-- John
At 15:41 1/20/01, Paul Farrar wrote:
For a rectilinear lens, which all Zuikos except the 8mm and 16mm fisheyes
try to be, it's
AOV = 2 * arctan( 21.7mm / focal length )
You can easily see that a 21mm has approximately a 90deg AOV.
For lenses longer than 50mm, you can use the approximation
AOV = 2400 / (focal length)
The actual limiting number is 2486.6, but 2400 is close enough and easy to
use.
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