It's really not much good, only acting like an ~32mm lens on an OM body.
Unless you want the off-center, straight-line-bending effects, I see no
reason to use a 16mm fisheye on an E-1.
Skip
Original Message:
-----------------
From: Bernard Frangoulis lists@xxxxxxxxx
Date: Mon, 1 Aug 2005 14:18:56 +0200
To: olympus@xxxxxxxxxx
Subject: [OM] 16mm fisheye on E-1
I am trying to understand what the field of view
of a 15 or 16mm fullframe fisheye (such as the
Olympus or Sigma ones) would be on a 4/3 body.
I found this site for explanations and formulas:
http://www.photo.net/learn/fov/index.html
So... the 4/3 sensor effective size is 17.3 *
13.0mm
(http://www.wrotniak.net/photo/oly-e/e1-rev.html#SENSOR),
i.e. a 21.6mm diagonal.
So the FOV of a full-frame fisheye 15mm lens would be:
4 * arcsin(21.6/(15*4)) = 84°
i.e. the FOV of a 24mm rectilinear lens in 35mm
terms, and not of a 30mm which we would obtain by
simply multiplying the focal length by 2.
For a 16mm:
79°
i.e. a FOV between a 24 (84°) and a 28mm (75°) rectilinear lens in 35mm
terms.
Whereas for a rectilinear 14mm:
2 * arctan(21.6/(14*2)) = 75°
i.e. a 28mm lens in 35mm terms: this time
(rectilinear lens) we can multiply the focal
length by 2.
So, maybe a Zuiko 16mm, or a Sigma 15 or 16mm, or
a Zenitar 16mm, wouldn't be useless on an E-1?
Bernard
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