[rollei_list] Re: Who uses a T as a 'daily driver'
- From: Eric Goldstein <egoldste@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Tue, 2 Feb 2010 07:46:52 -0500
Marc -
The ideal design speed of a miniature format 50 mm Tessar at that time
(and probably now) would be f/4-f/4.5. So, with apologies to Ivor, a
Tessar with an actual design speed of f/2.8 will not be best at f/4.
Very few lenses are produced at their optimal design speed. The only
recent example I can think of is the C/V Heliar 50/3.5. That lens
tested best at f/3.5 and by all accounts it is a truly remarkable
optic.
Eric Goldstein
--
On Mon, Feb 1, 2010 at 11:02 PM, Marc James Small <marcsmall@xxxxxxxxxxx> wrote:
> Eric
>
> There are two different lenses under discussion here, and I thought I had
> made that clear. Matanle speaks of the 2.8/50 CZ Tessar on the Contaflex
> Super B and later miniature-format SLR's. This lens was recomputed at the
> same time as the 3.5/75 CZ Tessar for the T and as part of the same project
> by the same designers, working under Hans Sauer.
>
> Again, my own experience is that the 3.5/75 JSK Xenars in the later
> Rolleicords are adequate lenses but hardly of stunning capabilities. I have
> used T's on several occasions and have always found the Tessar a grand lens.
>
> Bear in mind that a lot of my photography has been under low-light
> condition, so I rarely go above f/5.6 with any of my cameras. I will
> acknowledge that f/4 is the borderline condition for the Prewar
> front-cell-focusing 2.8/8cm CZJ Tessar as used in the Super Ikonta B and BX
> folders, but I understand from several users of the Ikoflex III that the
> unit-focus 2.8/8cm CZJ Tessar used on those cameras was capable of decent
> images wide-open.
>
> But, yes, a lens designed with a maximum aperture of f/3.5 will probably not
> shine at f/4!
>
> Marc
---
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