[rollei_list] Re: OT: Leica vs. Zeiss
- From: Frank Dernie <Frank.Dernie@xxxxxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Thu, 19 Nov 2009 06:51:40 +0000
M lenses can not be used on the R since the mounting flange to focal plane is
too short for a camera with a great big mirror box...
I have read that the late 1990s 50mm f1.4 for R is outstanding too, though I
have not seen one.
I have used some R lenses on Canon with an adaptor and a tiny number of M
lenses on my new Panasonic GH1 which has no mirror. I will probably try more
some day.
Frank
On 18 Nov, 2009, at 17:19, Peter K. wrote:
> You have tried this lens on an R System?
>
> On Tue, Nov 17, 2009 at 9:54 PM, Frank Dernie <Frank.Dernie@xxxxxxxxxxxxxx>
> wrote:
> Actually Apo is a typo in the case of this lens as such an item does not
> exist. The latest 50mm f1.4 is Aspherical not apo. It is by a long way the
> best f1.4 lens I have used wide open, and I have used a few. The new-Zeiss 50
> f1.5 sonnar is reported to be a retro lens and is soft and suitable for
> portraits wide open, though I have not used one personally. Only 2 Leica M
> lenses are marked Apo, the latest 90mm f2 and 135mm f3.4. I would be prepared
> to bet five bob that they really are apo...
> The Leica lenses I have, which is quite a few, may not all be apo, whether
> marked thus or not, but they show noticeably less chromatic fringing than
> most of the fast lenses I have from Nikon or Canon. FWIW.
> Frank
>
> On 17 Nov, 2009, at 23:15, Richard Knoppow wrote:
>
> >
> > ----- Original Message ----- From: "Jan Decher" <Jan.Decher@xxxxxxx>
> > To: <rollei_list@xxxxxxxxxxxxx>
> > Sent: Tuesday, November 17, 2009 8:53 AM
> > Subject: [rollei_list] Re: OT: Leica vs. Zeiss
> >
> >
> >> Marc,
> >>
> >> This is what I thought. So we should compare a current Summicron to the
> >> curretn Zeiss ZM Planar perhaps (tie?) and the Apo-Summilux to the new
> >> 1.5/50 Sonnar (Summilux wins, I suppose).
> >>
> >> I might take you up on stopping by at your house next time I am in the
> >> D.C. area (X-mas?). Aren't you down there somewhere (Virginia?).
> >>
> >> Really ought to see that PLOOT reflex housing ;-)
> >> ...and maybe you even have an original Contax OIympia Sonnar engraved by
> >> Leni Riefenstahl....
> >>
> >> Jan
> >
> > I wonder if the Apo-Summilux is really an apochromatic lens. The prefix
> > Apo has been used on a number of German-made lenses which are, in fact,
> > just plain achromats. For a while there was something in the DIN standards
> > that allowed this despite the very long use of the appellation apochromatic
> > to mean a lens with longitudinal chromatic correction for three colors and
> > correction for spherical aberration for two colors. The chromatic
> > aberration curves for apochromatic lenses has a characteristic S shape and
> > crosses the zero line (no chromatic error) in three places. An acromatic
> > lens is corrected for two colors for focus and one color for spherical. In
> > fact, a well designed achromat may have less deviation from focus at
> > intermediate colors than a poor apochromatic lens but, in the past, most
> > true apo's have been designed for special purposes, such as process work,
> > where it was imperative that chromatic correction be very good.
> > I don't think the term "apochromatic" has ever been officially defined
> > for camera lenses but it has for microscope and telescope objectives so the
> > term is very well established.
> > It is possible to correct a lens for any number of wavelengths. Those
> > corrected for more than three are known as superachromats. They are rare
> > because they are quite expensive to make and have little advantage as
> > general purpose camera lenses. Nonetheless they do exist for special
> > purposes.
> > Simply being apochromatically corrected is no guarantee of lens
> > performance, there are still many other aberrations that must be well
> > corrected.
> > As I stated before the only way to make definite comparisons of lenses
> > is to set them up on an optical bench and see what they do. If the actual
> > prescription is available one can set up the design in a computer lens
> > design program and analyse it. Modern programs can completely characterize
> > a lens in a few seconds, an analysis way beyond what could be accomplised
> > with hand or calculator assisted math in the past. Of course, the design
> > performance may not be realized in an actual production lens.
> >
> > --
> > Richard Knoppow
> > Los Angeles, CA, USA
> > dickburk@xxxxxxxxxxxxx
> > ---
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> --
> Peter K
> Ó¿Õ¬
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