Archived posting to the Leica Users Group, 2012/06/10

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Subject: [Leica] Using M (and R) glass on a Sony NEX-7 Now DATA
From: jayanand at gmail.com (Jayanand Govindaraj)
Date: Mon, 11 Jun 2012 09:44:12 +0530
References: <mailman.84.1339296468.1198.lug@leica-users.org> <757D7C4C-FDC2-4548-8483-7AB0AF672D4A@netvigator.com> <BLU139-DS51D7CC595D4CE41416140B8F00@phx.gbl> <2B3FF31F994548FFA69AFDC013E70C18@jimnichols> <CAH1UNJ3DG1E86pTFxkaJwBi6DuPiV_fA_1pEA0GGKbKQo1j4gw@mail.gmail.com> <F83B10AD192F423484DEB3A2C8EB210E@jimnichols>

Jim,
Shoot RAW. Get the exposure compensation right BEFORE the bee comes!
Cheers
Jayanand

On Mon, Jun 11, 2012 at 9:34 AM, Jim Nichols <jhnichols at 
lighttube.net>wrote:

> Hi Jayanand,
>
> That is all well and good, but the bee may be gone before the second shot
> can be made.  That is why I like to get the first one right. ;~)
>
>
> Jim Nichols
> Tullahoma, TN USA
> ----- Original Message ----- From: "Jayanand Govindaraj" <
> jayanand at gmail.com>
>
> To: "Leica Users Group" <lug at leica-users.org>
> Sent: Sunday, June 10, 2012 10:52 PM
>
> Subject: Re: [Leica] Using M (and R) glass on a Sony NEX-7 Now DATA
>
>
>  Why does all this matter? Look at the histogram and adjust! Digital makes
>> it so easy to get a good exposure....
>> Cheers
>> Jayanand
>>
>> On Mon, Jun 11, 2012 at 1:15 AM, Jim Nichols <jhnichols at 
>> lighttube.net>**
>> wrote:
>>
>>  Aram,
>>>
>>> I will add to the confusion.
>>>
>>> After plotting your data on the NEX-7, I became curious about my Olympus
>>> E-1, which is an early professional model.  I compared the companion
>>> lens,
>>> which was the Olympus 14-54 zoom, to my Summicron-R and my Elmarit-R 60mm
>>> Macro.  By some stroke of luck, I was able to use a log scale for this
>>> one,
>>> which helps with the comparison.  I have tried to do the same for my
>>> first
>>> chart of your data, but can't find that option again.
>>>
>>> If the 14-54 lens, which communicates with the camera, is taken as the
>>> "standard", then my Elmarit-60 is not too far off this line.  However, my
>>> sample of the Summacron-R 50mm shows that it departs from the norm,
>>> particularly above f/8.  In your data, this departure starts at about
>>> f/5.6. After seeing this, I would not choose the Summicron-R as a measure
>>> of performance for a Leica prime lens.  My Elmarit-R 60 looks much
>>> better.
>>>
>>> In looking at your data for the Leica zoom, I begin to wonder if there
>>> are
>>> too many compromises in zoom lens design.  I did not pursue recording the
>>> 14-54 data at other focal lengths.
>>>
>>> Jim Nichols
>>> Tullahoma, TN USA
>>> ----- Original Message ----- From: "Aram Langhans" <leica_r8 at 
>>> hotmail.com
>>> >
>>> To: "Leica Users Group" <lug at leica-users.org>
>>> Sent: Sunday, June 10, 2012 11:00 AM
>>> Subject: Re: [Leica] Using M (and R) glass on a Sony NEX-7 Now DATA
>>>
>>>
>>>  That's what I mean, too, except the Nikon D7000 and D300 does not behave
>>>
>>>> the same as Howard's D700.
>>>>
>>>> Can anyone make sense of these data?
>>>>
>>>> Lens 1 is Nikon 50/1.2
>>>> Lens 2 is Leica-R 50/2 Summicron
>>>> Lens 3a is Leica-r 35-70/4 shot at 35mm
>>>> Lens 3b is same lens shot at 50mm
>>>> Lens 3c is same lens shot at 70mm
>>>>
>>>> Subject, an evenly lit patch of grass in my front lawn.  Went through
>>>> the
>>>> f-stops twice for each lens to check consistency.  Same reading each
>>>> time.
>>>>
>>>>
>>>> f-stop        Lens 1          Lens 2          Lens 3a             Lens
>>>> 3b
>>>> Lens 3c
>>>> 2                 1600             1600
>>>> 2.8                 800             1000
>>>> 4                    400               400             640 500 640
>>>> 5.6                 200               100             160 200 320
>>>> 8                    100                 40                50 60 100
>>>> 11                    50                 25                30 30 50
>>>> 16                     25                15                20 20 20
>>>>
>>>> As you can see, the Nikon behaves as it should be and meters correctly
>>>> through the f-stop range, halving the shutter speed for each smaller
>>>> f-stop.
>>>> The Leica lenses do not and progressively overexpose as you stop the
>>>> lens
>>>> down.  I am surprised that the zoom did not meter correctly wide open.
>>>> In
>>>> my field experience, wide open is not a problem, and the overexposure
>>>> only
>>>> starts to show up as you stop down.
>>>>
>>>> I am also surprised that the overexposure is limited to about one stop.
>>>> In my field experience I sometimes have to compensate about 2 stops.
>>>>
>>>> That said, there is about a one stop overexposure in this test while my
>>>> Canon, when I had it, would overexpose about 4 stops if you stopped down
>>>> enough.
>>>>
>>>>
>>>>
>>>>
>>>> ------------------------------****--------------------
>>>>
>>>> From: "H&E Cummer" <cummer at netvigator.com>
>>>> Sent: Sunday, June 10, 2012 6:04 AM
>>>> To: <lug at leica-users.org>
>>>> Subject: [Leica] Using M (and R) glass on a Sony NEX-7
>>>>
>>>>
>>>>  Date: Sat, 9 Jun 2012 16:13:38 -0600
>>>>> From: Bill Nelsch <photobynelsch at gmail.com>
>>>>> Subject: Re: [Leica] Using M (and R) glass on a Sony NEX-7
>>>>> To: Leica Users Group <lug at leica-users.org>
>>>>>
>>>>> I have a stupid question:  When you say the D7000 is "linear" - what
>>>>> does
>>>>> that mean actually?  How does that affect the exposure?
>>>>>
>>>>> Bill in Denver
>>>>>
>>>>> Hi Bill,
>>>>> By linear I mean that as you close down the lens aperture the shutter
>>>>> speed drops by an equal amount in terms of light transmission
>>>>> If you are at f5.6 and 1/500 and then close down to f8.0 the shutter
>>>>> speed adjusts to 1/250 - to f11.0 the shutter speed drops to 1/125
>>>>> keeping the light transmission the same. That's what happens on the
>>>>> Nikon. On the Canon without Canon lenses that "talk" to the body
>>>>> as you close down a Leica R lens mounted with an adapter that isn't
>>>>> chipped the shutter speeds drift away from the above response and you
>>>>> get
>>>>> more and more exposure variation.
>>>>> Hope this clarifies my point for you.
>>>>> Cheers
>>>>> Howard
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>  ______________________________****_________________
>>>> Leica Users Group.
>>>> See 
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>>>> <http://**leica-users.org/mailman/**listinfo/lug<http://leica-users.org/mailman/listinfo/lug>>for
>>>> more information
>>>>
>>>>
>>>>
>>>>
>>>
>>> ______________________________****_________________
>>> Leica Users Group.
>>> See 
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>>> <http://**leica-users.org/mailman/**listinfo/lug<http://leica-users.org/mailman/listinfo/lug>>for
>>> more information
>>>
>>>
>> ______________________________**_________________
>> Leica Users Group.
>> See 
>> http://leica-users.org/**mailman/listinfo/lug<http://leica-users.org/mailman/listinfo/lug>for
>>  more information
>>
>>
>>
>
>
> ______________________________**_________________
> Leica Users Group.
> See 
> http://leica-users.org/**mailman/listinfo/lug<http://leica-users.org/mailman/listinfo/lug>for
>  more information
>


Replies: Reply from jhnichols at lighttube.net (Jim Nichols) ([Leica] Using M (and R) glass on a Sony NEX-7 Now DATA)
In reply to: Message from cummer at netvigator.com (H&E Cummer) ([Leica] Using M (and R) glass on a Sony NEX-7)
Message from leica_r8 at hotmail.com (Aram Langhans) ([Leica] Using M (and R) glass on a Sony NEX-7 Now DATA)
Message from jhnichols at lighttube.net (Jim Nichols) ([Leica] Using M (and R) glass on a Sony NEX-7 Now DATA)
Message from jayanand at gmail.com (Jayanand Govindaraj) ([Leica] Using M (and R) glass on a Sony NEX-7 Now DATA)
Message from jhnichols at lighttube.net (Jim Nichols) ([Leica] Using M (and R) glass on a Sony NEX-7 Now DATA)