[rollei_list] Re: OT:Walter Voss Diax cameras
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Thu, 22 Oct 2009 13:20:05 -0700
----- Original Message -----
From: "Eric Goldstein" <egoldste@xxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Thursday, October 22, 2009 12:19 PM
Subject: [rollei_list] Re: OT:Walter Voss Diax cameras
On Thu, Oct 22, 2009 at 2:17 PM, Richard Knoppow
<dickburk@xxxxxxxxxxxxx> wrote:
The diagonal for 66 is neither 75 nor 80 mm, either. So I
doubt that
most normal lenses are truly the diagonal fo the film
format, but they
are close...
Eric Goldstein
The measured dimensions of a Rollei negative are
exactly 2-1/4 x 2-1/4 so the diagonal comes out to slightly
more than 80mm. If the negative is cropped to 8x10
dimensions it comes out slightly more than 73mm.
I suspect the reason for using the 80mm focal length
for the f/2.8 cameras was simply to make it easier to
correct the marginal rays.
Kodak made some 35mm cameras with shorter than 50mm
lenses, the Kodak 35 being an example. I think the lens was
44mm.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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