Archived posting to the Leica Users Group, 2011/04/12

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Subject: [Leica] IMG: Foothill Park
From: richard at imagecraft.com (Richard Man)
Date: Tue, 12 Apr 2011 13:18:22 -0700
References: <747098.9554.qm@web82101.mail.mud.yahoo.com> <BD38DC430E434F79B63832050B44DA53@jimnichols> <BANLkTinCi_aYvnyQwfM+g=DF=yB+4gFX4Q@mail.gmail.com> <73337DCD-F5D6-473E-8D88-47F701682A26@yahoo.com> <BANLkTi=FSkpi_ohAbE0OniE6JSZQ0C_OZw@mail.gmail.com> <BANLkTi=+M1BLnkM8Lv96PF2V3uYRUq2dHg@mail.gmail.com> <445631.37765.qm@web82101.mail.mud.yahoo.com> <45483E93-FFE8-494A-B02C-6DEAFE743F3F@mac.com> <BANLkTim36en9bKRqCLbhAy-KX6MFHH+3Zw@mail.gmail.com> <A4DAF305-866A-4453-A3F9-CC58C984EB8E@yahoo.com> <0E6F0344-95E3-45C7-B662-BD13399721F3@mac.com> <304709.88896.qm@web82107.mail.mud.yahoo.com> <BANLkTikAJ8hg5aN4ZoJyWaXa5raFxT-ERQ@mail.gmail.com> <825D9BB7-8BEA-4A07-9582-CD1F28A0ADB3@mac.com> <BANLkTim3qf+S0ExZhH88WfWRVycQsdxZxQ@mail.gmail.com> <p06230909c9ca4d6c1078@192.168.1.21> <57C8F30B-F296-493A-936D-EDC8A4E40C46@yahoo.com> <p0623090ac9ca5bbd6b4f@192.168.1.21> <22005DB4-3301-414C-B8DD-0BE263546184@yahoo.com>

Why not the 40 then? I have the 50 and it is large but it may save you some
trouble?
On Apr 12, 2011 1:11 PM, "Bob Adler" <rgacpa at yahoo.com> wrote:
> Got it. Thanks both non-George and George.
> So what I will be doing if I want wide angle shots on this trip is
sticking the 80 on the flex, mounting the Flex sideways, mounting the back
vertically, focus near far with tilt if needed, and shifting the back from
left to right (or horizontally) to get an extra 2cm of image circle
coverage.
>
> Not quite the same as my 50 or 40, but it will have to do.
>
> Really appreciate your help. Many thanks,
> Bob
>
> Bob Adler
> http://www.rgaphoto.com
>
> On Apr 12, 2011, at 1:00 PM, Henning Wulff <henningw at archiphoto.com>
wrote:
>
>> There are a couple of things at work here. When you have sensor and focus
plane parallel and the lens axis perpendicular to both, you have constant
magnification across the image (if your lens has no geometric distortion).
As soon as you tilt the sensor you vary the magnification from top to bottom
(side to side if you swing the sensor or lens). Because your nodal points
will be moving, after you shift these magnification will be shifted as well
and your two images won't overlap properly, so you'll have to scale one of
them. Refocussing also clearly changes the magnification. A headache all
around.
>>
>>
>> At 12:26 PM -0700 4/12/11, Bob Adler wrote:
>>> Hi Henning,
>>>
>>> I think what you're saying is what I suspected. If I shift the back to
the top, focus and tilt, then shift the back to the bottom, refocus (tilt
probably won't be needed for the far objects), then I will have a different
proportion of the image circle recorded on the sensor? Thats because
refocusing changes the size of the image circle recorded, yes? And stitching
will be difficult?
>>>
>>> Thanks for clarifying...
>>> Bob
>>>
>>> Bob Adler
>>> http://www.rgaphoto.com
>>>
>>> On Apr 12, 2011, at 12:05 PM, Henning Wulff <henningw at archiphoto.com>
wrote:
>>>
>>>> This is from Not-George, but I've done this kind of stuff at various
times.
>>>>
>>>> One possible solution at this time is to use a scanning back such as
one of the Betterlight's. You have motion problems, and they have bulk/cord
issues, but stitching is avoided and you get exceptional detail (and huge
files). Otherwise, yes, film is still a good solution. A problem with
tilting, shifting and then stitching the result is that the image size of
the parts that you want to merge in the shift is then usually at different
magnifications.
>>>>
>>>> At present the Canon with TSE lenses makes it easy. But it's no 8x10.
The best one shot digital solution right now is a technical camera and a
high-res MF back, but that is also the priciest.
>>>>
>>>> As far as carrying things at altitude: When we went to the Himalayas, I
carried a Mamiya 6 with 3 lenses, a Horizon 150 (MF) and a couple of Leicas
with 5 lenses plus tripod etc and a ton of film.
>>>>
>>>> We hiked up to 14750ft (4500m). The first day or two were tough, but
then things smoothed out and we went, as our guide used to say "a little bit
up, a little bit down". That meant down 1500-2000m into the valley and then
the same distance up again, over and over. The sherpas carried the food and
tents and stuff, but we carried all the camera stuff myself plus some
clothing. We were advised to practice by finding a 20-30 storey building at
home and practicing an hour or two each day going up and down the stairs
with a load. It still doesn't really prepare you for altitude, though. The
main thing for the altitude preparation was to clim high during the day and
go down 500m or so to sleep each evening. No one in our group got altitude
sickness. A couple of years later, in the Andes at comparable altitudes I
got altitude sickness and suffered a couple of days.
>>>>
>>>>
>>>>
>>>> At 10:34 AM -0700 4/12/11, Richard Man wrote:
>>>>> So George, educate me a bit here please as I don't know the world of
>>>>> tilt-shift much except "in theory."
>>>>>
>>>>> So are you saying that the ideal solution, barring that it's not
digital, is
>>>>> a large format camera shooting on film, with a wide angle lens?
>>>>>
>>>>> --
>>>>> // richard <http://www.imagecraft.com/>
>>>>
>>>> --
>>>>
>>>> Henning J. Wulff
>>>> Wulff Photography & Design
>>>> mailto:henningw at archiphoto.com
>>>> http://www.archiphoto.com
>>>>
>>>> _______________________________________________
>>>> 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
>>
>> --
>>
>> Henning J. Wulff
>> Wulff Photography & Design
>> mailto:henningw at archiphoto.com
>> http://www.archiphoto.com
>>
>> _______________________________________________
>> 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


Replies: Reply from imagist3 at mac.com (George Lottermoser) ([Leica] IMG: Foothill Park)
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In reply to: Message from rgacpa at yahoo.com (Bob Adler) ([Leica] IMG: Foothill Park)
Message from jhnichols at lighttube.net (Jim Nichols) ([Leica] IMG: Foothill Park)
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