[rollei_list] Re: Sweet spot: f8/f11?
- From: Edward Meyers <aghalidebw@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Sun, 23 Oct 2011 17:43:20 -0400
Burt Keppler hated to be called Herbert. As far as the Rollieflex lenses are
concerned, I am the guy who tested them. What I remember 5.6 was the magic f
number. I believe the results of the tests that you refer to are based on
resolution.
Ed Meyers, former technical editor of Modern Photography in 1960s.
On Sun, Oct 23, 2011 at 8:02 AM, Marc James Small <marcsmall@xxxxxxxxxxx>wrote:
> At 07:28 AM 10/23/2011, CarlosMFreaza wrote:
> >2011/10/22 Bob James <starboy0@xxxxxxxxxxxxx>:
> >> So for the TLR 2.8f which aperture allows the lens to perform at its
> >best? f8, f11?
> >
> >It's interesting to note while most standard lenses have the best
> >performance between f8 and f11, Planars and Xenotars 2.8/80 have the
> >best performance at f16 (both lenses, I agree with this test following
> >my experience with the Xenotar 2.8/80) according some "Modern
> >Photography" magazine tests (Herbert Kaplan) made when cameras and
> >lenses were brand new ( 2.8F, I posted the link last August). BTW, you
> >could have your own preferences according the photography you are
> >doing; I like my Xenotar at f5.6 very much for portraits, it offers a
> >very right sharpness for the subject and a good separation regarding
> >the background and the "bokeh" is from acceptable to good in general
> >for this f/stop.
> >In the other hand, the best performance for Planar and Xenotar 3.5/75
> >is at f/11 according the same tests.
>
> Carlos
>
> I would approach any camera magazine test of lens quality with a bit of
> caution. Burt Keppler was a good commentator but, then, he was also a man
> of pronounced biases.
>
> The Carl Zeiss MTF data seems to set out that the 2.8/80 Planar used in the
> GX and FX cameras achieves its best performance from f/5.6. I am not aware
> of similar scientific tests done on the earlier versions of this lens or on
> the Xenotar. In my personal experience, both lenses as used in the 2.8F and
> earlier cameras peak from f/8 but, again, my own experience is hardly any
> more a scientific test than were the musings of Burt Keppler.
>
> Marc
>
>
> msmall@xxxxxxxxxxxx
> Cha robh bàs fir gun ghràs fir!
>
>
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