Archived posting to the Leica Users Group, 2000/10/05

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Subject: [Leica] Effective Base-Line
From: Marc James Small <msmall@roanoke.infi.net>
Date: Thu, 05 Oct 2000 22:13:39 -0400
References: <Pine.SOL.4.10.10010031747510.16011-100000@seawolf.gpcc.itd.umich.edu> <39DC09E4.1BCC4A4C@bigfoot.com>

At 07:33 PM 10/5/2000 -0400, Dante A Stella wrote:
>I will rephrase these questions into a format that is more pointed.  And
yes, I will see
>if I can locate a copy of Osterloh's book, although I am not sure it will
answer any of
>these questions.  Mr. Small may be able to shed some light on this,
especially the
>development of the III vs the M3 and Zeiss's theories...


Hmm.  I understand that effective base-line IS a real factor.  That is, a
real base-line of 10cm magnified at a power of 1.5X should be APPROXIMATELY
equal to a real base-line of 15cm.  Certainly, Leitz felt so in their
design of the later LTM cameras, with their magnified RF's.  I have always
found the IIIc and later RF easier to use than the later M's due to this.
It is more accurate in practice.

But, of course, the LONG baselines on some of these cameras is quite
interesting.  The Kodak Ektra had a real base-line of 105mm, and the early
Contax I's had an effective base-line of 92.7mm.  By comparison, the later
LTM cameras only had an effective base-line of 57mm.

Marc


Marc

msmall@roanoke.infi.net  FAX:  +540/343-7315
Cha robh bas fir gun ghras fir!

In reply to: Message from Dante Stella <dante@umich.edu> (Re: Is EBL a construct? Was: Re: [Leica] M6 TTL .58 accurate with a Noctilux?)
Message from Dennis Painter <dpainter@bigfoot.com> (Re: Is EBL a construct? Was: Re: [Leica] M6 TTL .58 accurate with a Noctilux?)