[Leica] IMG: Foothill Park

[rgacpa at yahoo.com (Bob Adler)]

Our pleasure!
:-)
?Bob Adler
Palo Alto, CA
http://www.rgaphoto.com 




________________________________
From: Jayanand Govindaraj <jayanand at gmail.com>
To: Leica Users Group <lug at leica-users.org>
Sent: Tue, April 12, 2011 7:33:34 PM
Subject: Re: [Leica] IMG: Foothill Park

Bob/Richard,
I leave this mumbo jumbo for you two to decode! (-:
Thank heavens I don't shoot much landscape!
Cheers
Jayanand

On Wed, Apr 13, 2011 at 1:48 AM, Richard Man <richard at imagecraft.com> 
wrote:

> 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
>
> _______________________________________________
> Leica Users Group.
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>

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