"Rand E. Tomcala" <rtomcala@xxxxxxxxxxx> moved upon the face of the 'Net and
spake thusly:
> Paul,
> Is there an easy way to figure the angle of view for lens of less than
> 50mm. Is there a table somewhere on the internet. Case in point, I
> have a 17mm standard view lens, what is the angle of view and how would
For a non-fisheye, angle of view is
2 * arctangent ( film-dimension / ( f * 2 ) )
eg. for 50mm
2 * atan ( 43.2 / 100 ) = 46.72 degrees (on the diagonal)
Remember to keep your units the same--millimetres or metres or
whatever, and beware that many programming languages and calculators
give inverse trigonometric results in radians, not degrees. Multiply
by ( 180 / pi ) to convert radians to degrees.
Extreme wide-angle lenses do such varied trickery that this formula
breaks down, and field of view is best determined experimentally (or
by RTFM).
Chris.
--
| Christopher Biggs email:chris@xxxxxxxxxxxxxx | Linux: The choice of a GNU |
| Stallion Technologies, Queensland, Australia | Generation. |
| VoiceNet +61-7-3270-4266 Fax +61-7-3270-4245 | Mates dont let mates do DOS |
| Send mail with "Subject: sendpgpkey" for my PGP public key. MIME mail OK |
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|