Archived posting to the Leica Users Group, 1997/08/10

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]
Subject: Re: Standard Focal Lengths
From: ABreull@aol.com
Date: Mon, 11 Aug 1997 02:43:49 -0400 (EDT)
 
There is a usual computation for the standard focus: It's the root out of
2*(square of larger side of negative format), e.g. 36 mm is the larger side
of the 35 mm format, then

standard = root of (2 * 36**2) = root of (2*1296) = 50.9117 (mm)

or for MF:

MF         = root of (2 * 60**2) = root of (2*3600) = 84.8528 (mm)

which shows also the known fact, that the usual MF standard focus tends to be
a (small) wide angle.

- -Alf