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

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Subject: [Leica] OT - Sony Alpha 7R
From: john at mcmaster.co.nz (John McMaster)
Date: Mon, 24 Feb 2014 22:21:09 +0000
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>

http://www.getdpi.com/forum/sony/49391-fun-a7-7r.html and the next 59 pages 
shows a wide variety of lenses on the A7(R).....

john
________________________________________


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?
>>>>>
>>>>


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)