At 08:38 AM 1/20/01 -0800, you wrote:
>So, there's no direct relationship between the angle of view and focal
>length? Does this have to do with whether or not there is rectilinear
>correction?
>-Mickey
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.
Paul
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