[rollei_list] Re: OT: 35mm RF (Voigtlander Bessa)
- From: Jerry Lehrer <jerryleh@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Wed, 19 Apr 2006 18:42:40 -0700
Richard,
Right, about the effects of viewfinder reduction. Leica has made a
relatively inexpensive viewfinder magnifier which I consider to be
a necessity for critical focusing with long lenses.
Jerry
Richard Knoppow wrote:
> ----- 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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