On 25 Apr 2001, at 13:20, [EMAIL PROTECTED] wrote:
> I realize that attributes such as focal length may vary slightly from
> sample to sample. But many of you have commented that a 20's FOV is
> dramatically wider than a 24, and my Zeiss is only modestly wider. I
> thought the relationship between focal length and field of view was more or
> less fixed.
>
> Comments?
Hi Paul,
Lens FL vs AOV for a corrected rectilinear lens are "fixed" so to speak, they
can easily be calculated knowing the aspect ratio, the diagonal length of the
projected image and the actual lens FL. Lens to lens the Pentax series
exhibit the expected variation in AOV for each FL and from rough
calculations little variation from theoretical expectations.
I don't know about CZJ designed lenses however a recent Contax 25mm SLR
lens designed by CZ was closer in FL to 26 than 25 resulting in very little
difference in AOV than the 28mm in the same lens series.
Cheers,
Rob Studdert
HURSTVILLE AUSTRALIA
Tel +61-2-9554-4110
Fax +61-2-9554-9259
UTC(GMT) +10 Hours
[EMAIL PROTECTED]
http://www.ozemail.com.au/~distudio/publications.html
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