[rollei_list] Re: OT: 35mm RF (Voigtlander Bessa)

  • From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
  • To: <rollei_list@xxxxxxxxxxxxx>
  • Date: Wed, 19 Apr 2006 17:52:28 -0700


----- Original Message ----- From: "Marc James Small" <msmall@xxxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Wednesday, April 19, 2006 2:47 PM
Subject: [rollei_list] Re: OT: 35mm RF (Voigtlander Bessa)



At 11:09 PM 4/19/06 +0200, Thor Legvold wrote:

Hi Marc,

I appreciate the answer. From the little I've read on RF systems, I had
thought focusing anything under 28mm or over about 150mm was pretty
much impossible with any degree of accuracy. How do you manage the 12mm
and the longer teles?


What approximate used prices am I looking at for something like a
1.4/35mm, 1.4/50mm and/or 2/90mm? They don't have to be exotics (ASPH)
for me if they're available in a regular formula.

Focusing accuracy depends on rangefinder baselength, and the Kodak Ektra is
the king here, followed by the Contax II and III -- the Contax II and III
will JUST allow a 180mm lens to be focused but great care is required. The
4.5/21 is not RF coupled but with its immense Depth of Field, this is not
an issue. And for lenses longer than 135mm and for macro work, I use a
reflex housing, generally a Visoflex III, though I have a slew of these
guys as well in both LTM and M.


The three lenses you mention ought to be easily found at $400 or less,
perhaps slightly higher for the 2/90 pre-ASPH.


Marc

msmall@xxxxxxxxxxxx
Cha robh bàs fir gun ghràs fir!

NEW FAX NUMBER:  +540-343-8505

There is a little more to it. Its the base line plus whatever magnification there is in the viewer. Leica thread mount cameras have a 2X telescope in the rangefinder so the effective baselind of the rangefinder is doubled. Cameras like the Ektra and Contax, which have the rangefinder image combined with the viewfinder, can not have telescopes so must have a physically longer rangefinder baseline for the same focus sensitivity.

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx


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