Archived posting to the Leica Users Group, 2014/02/24

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Subject: [Leica] OT - Sony Alpha 7R
From: sonc.hegr at gmail.com (Sonny Carter)
Date: Mon, 24 Feb 2014 16:08:25 -0600
References: <CF2BB9E0.185C5%mark@rabinergroup.com> <5321466E-C881-40C2-AB08-4C66A30B3654@gmail.com> <CAFfkXxsWcCic2qhJegHpoerEnFh1ZB7zm6_47qHdVhUkn9hGww@mail.gmail.com> <2B9DDEAB-D9F4-4E7F-B0CD-663F5090D7D7@gmail.com> <3F24E644-A878-4172-AF84-EEEDBBAF40DC@gmail.com> <1F81C9A1-127D-466E-BA2E-DBD3A9E9F883@gmail.com> <FE5E005E-0ED3-405D-ABAE-20D035F8AD35@gmail.com> <CAE3QcF4KERPt8rUy5+xhoSBFcnzRJ_ET7MZT8SiGHYxbb7xfTw@mail.gmail.com> <CAFfkXxtU_bRL4G6kT5nzj00P_Fe12O+jA95bHr5gD7iKj9ch3w@mail.gmail.com> <4E9DD6B6-E721-46E2-B910-62AC7A2FAC89@gmail.com>

Jim, As I've said before, it is not too worrisome to me as I don't really
like what a 15 does in landscape work.  The 21 is a more interesting lens
to me, but then I do have the M9 as a platform for it, and so it might be
nice to carry two cameras, one with a 21, the A7r with a 35 and  a 75 mm
(Is that a tele or are you happy to see me?) in my pocket. ;-)

By the way, my new porch is the perfect height to shoot nice square 15mm
shots of Adreen's house across the street.  The garden of that house is
where I get many of my Friday Flowers each week.


On Mon, Feb 24, 2014 at 3:46 PM, Jim Laurel (gmail) <jplaurel at 
gmail.com>wrote:

> Thank you for doing this quick test, Sonny. Looks like the CV 15mm Heliar
> has same issue as with the M9 and M240, only much worse. The M240 with the
> lens set to the 21mm Elmarit shows far less magenta in the corners. That's,
> of course, easy to correct with CornerFix or LR Flat Field, but the more
> worrisome thing is how soft the edges are with both lenses. I have the
> Heliar and the Elmarit 21mm ASPH and while the Heliar does exhibit some
> minor magenta shift on the edges, at least the edges are sharp. And of
> course, on the M240, the Elmarit is perfect. I am surprised to see that
> much color shift with your pre-asph Elmarit 21 on the A7, though.
>
> I suspect that you would not have these color shifts or edge sharpness
> falloff with SLR lenses adapted to the A7. It would be interesting to see
> how a 24mm or 19mm Elmarit R would perform. I have been playing with the
> 24mm Elmarit R on the M240 with the Leica adapter and it works perfectly.
>
> Thanks again for taking the time to demo this... Very informative.
>
> --Jim
>
>
> On Feb 21, 2014, at 4:28 PM, Sonny Carter <sonc.hegr at gmail.com> wrote:
>
> > This was a totally unscientific test, but Jim Laurel asked a question,
> and
> > I had the stuff to answer it, and I think it will help me in the future.
> >
> > The question was, Does the V/C 15mm exhibit magenta corners with the Sony
> > A7r?  Also up was the question of smearing with wides on that camera.
> > Looks like the answer is yes on both counts, though it may not be only
> the
> > camera.  (I haven't tested the lens for smearing on my M9.)
> >
> > I also held a ir-uv cut filter up to one side of the lens, and to my eye,
> > it seemed to lessen the magenta effect.  If I can find one of the correct
> > diameter, I'll try that one again full frame.
> >
> > I also did the same shot with my  21 pre asph Elmarit and the Sony Zoom
> set
> > at 28mm.
> > I just set the camera at auto for all 3 lenses.
> >
> > This test probably is not in depth enough for some of you, but it tells
> me
> > what I want to know, and that's to use these two lenses on my M9.  Easy
> > enough, as I barely use them anyhow.  I rarely take a 35 off my camera
> ever
> > except for my flower shooting.
> >
> > Here are the snaps.
> >
> > http://sonc.com/look/?page_id=3324
> >
> > To see full sized jpegs of the four shots, go to www.sonc.com/a7r
> >
> > www.sonc.com/a7r/15-big-DSC00641.jpg
> > www.sonc.com/a7r/21bigDSC00648.jpg
> > www.sonc.com/a7r/28zoomDSC00650.jpg
> > www.sonc.com/a7r/filter-bigDSC00645.jpg
> >
> >
> > On Fri, Feb 21, 2014 at 6:23 PM, Geoff Hopkinson <hopsternew at gmail.com
> >wrote:
> >
> >> Leica raah raah forum !!
> >> On Feb 22, 2014 1:00 AM, "Steve Barbour" <steve.barbour at gmail.com>
> wrote:
> >>
> >>>
> >>> On Feb 20, 2014, at 5:46 PM, Jim Laurel (gmail) <jplaurel at gmail.com>
> >>> wrote:
> >>>
> >>>> All I've seen, Steve, is some anecdotal evidence. Don't get me started
> >>> on Ken Rockwell, but on this page, he does have some examples of a 21mm
> >>> Super Elmar-M adapted to the A7 that appears to show sensor reflections
> >> and
> >>> smeared corner detail. Lurking around the dpreview forums, I've seen
> >> others
> >>> report similar results. But of course it's hard to know for sure
> >>>>
> >>>> http://www.kenrockwell.com/tech/comparisons/2013-12-leica-sony-canon/
> >>>
> >>> hi Jim, we are happy to see you back. My point of course is....we don't
> >>> exactly have PROOF of anything, though we do have anecdotal and
> selected
> >>> stories by people with an agenda. No completeness or worst case
> scenarios
> >>> by unbiased individuals with data for the leica M240, as well as the
> Sony
> >>> A7 and A7r. Selected stories to make a  point by people who wish to
> make
> >> a
> >>> point. No semblance of a real unbiased careful comparison. All of this
> is
> >>> then presented to a leica rah rah forum by people who like leica,
> whether
> >>> they use one or not.. I would like to know what the real facts are,
> based
> >>> on real world data, with carefully done comparisons. And if the cameras
> >> in
> >>> question have flaws in some areas, I will use the cameras accordingly,
> >>> always the case for all of us.
> >>> I used a CV 12 mm lens on my A7r, with many usable results, but some
> >>> unacceptable results as well.
> >>> That alerted me to be careful, especially with the widest of the wide.
> >>> Extrapolating this to all lenses under 50mm is not a conclusion based
> on
> >>> the facts. Some results of the widest lenses are acceptable, and we
> need
> >> to
> >>> have some reasonable ground rules. It occurred to me that we don't have
> >>> rigorous comparative data, even for the M240. What is clear is that
> >> many!!
> >>> lenses on the A7r, give incredibly wonderful results, it would seem far
> >>> greater in number for the A7r than the M240 because the list includes
> >> most
> >>> lenses ever made by most optical companies, including all of the leica
> R
> >>> lenses.
> >>>
> >>> Looked at in this light, I feel that the least we need to do, is
> approach
> >>> this question with complete  understanding of the situation, an open
> >> mind,
> >>> and armed with some real world comparative data.
> >>>
> >>> By the way, the above subject line says OT, but in my estimation this
> >>> subject is very much on topic.
> >>>
> >>> thanks for bringing it up,
> >>>
> >>> Steve
> >>>
> >>>
> >>>
> >>>> --Jim
> >>>>
> >>>>
> >>>>
> >>>> On Feb 20, 2014, at 5:10 PM, Steve Barbour <steve.barbour at 
> >>>> gmail.com>
> >>> wrote:
> >>>>
> >>>>>
> >>>>>
> >>>>> Sent from my iPhone
> >>>>> Steve Barbour
> >>>>>
> >>>>> On Feb 20, 2014, at 4:39 PM, Jim Gmail <jplaurel at gmail.com> wrote:
> >>>>>
> >>>>> Aren't there a lot if reported issues with adapted lenses? The Leica
> M
> >>> primes, at least, seem to perform much better on the M240 than on the
> A7.
> >>>>>
> >>>>> where is this proven?
> >>>>>
> >>>>
> >>>>
> >>>> _______________________________________________
> >>>> Leica Users Group.
> >>>> See http://leica-users.org/mailman/listinfo/lug for more information
> >>>
> >>>
> >>> _______________________________________________
> >>> Leica Users Group.
> >>> See http://leica-users.org/mailman/listinfo/lug for more information
> >>>
> >>
> >> _______________________________________________
> >> Leica Users Group.
> >> See http://leica-users.org/mailman/listinfo/lug for more information
> >>
> >
> >
> >
> > --
> > Regards,
> >
> > Sonny
> > http://sonc.com/look/
> > Natchitoches, Louisiana
> > 1714
> > Oldest Permanent Settlement in the Louisiana Purchase
> >
> > USA
> >
> > _______________________________________________
> > Leica Users Group.
> > See http://leica-users.org/mailman/listinfo/lug for more information
>
>
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information
>



-- 
Regards,

Sonny
http://sonc.com/look/
Natchitoches, Louisiana
1714
Oldest Permanent Settlement in the Louisiana Purchase

USA


In reply to: Message from mark at rabinergroup.com (Mark Rabiner) ([Leica] OT - Sony Alpha 7R)
Message from jplaurel at gmail.com (Jim Laurel (gmail)) ([Leica] OT - Sony Alpha 7R)
Message from sonc.hegr at gmail.com (Sonny Carter) ([Leica] OT - Sony Alpha 7R)
Message from jplaurel at gmail.com (Jim Gmail) ([Leica] OT - Sony Alpha 7R)
Message from steve.barbour at gmail.com (Steve Barbour) ([Leica] OT - Sony Alpha 7R)
Message from jplaurel at gmail.com (Jim Laurel (gmail)) ([Leica] OT - Sony Alpha 7R)
Message from steve.barbour at gmail.com (Steve Barbour) ([Leica] OT - Sony Alpha 7R)
Message from hopsternew at gmail.com (Geoff Hopkinson) ([Leica] OT - Sony Alpha 7R)
Message from sonc.hegr at gmail.com (Sonny Carter) ([Leica] OT - Sony Alpha 7R)
Message from jplaurel at gmail.com (Jim Laurel (gmail)) ([Leica] OT - Sony Alpha 7R)