On Nov 3, 2007, at 2:39 PM, Gregory Sogorka wrote:
If this is the fact, I am interested to know what unit is used to
measure focal length.
The metric system. Of course, that can also depend on who you talk to. I'm a stickler about optics terms (at least, that's what I went to school for - physics/optical engineering).
It's measured in meters, but often printed in mm because it's easier to read than say, .0XX.
For instance, you state that a focus value of
28 is a fisheye lens when is terms of miillimeters a 10-15mm lens is a
fisheye lens.
A fisheye lens is a wide angle lens. There are two types. Circular and Full-Frame .
Circular fisheye lenses usually the focal length is somewhere between 8-10mm. For a full-frame it's around 15-16mm.
A 28mm lens is not a 'fisheye' lens. It's just a normal wide angle lens.
How do mm values of real lens translate in the
papervision world ?
Oof. Who knows. :)
- jon
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