Archived posting to the Leica Users Group, 2011/04/12
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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. > See http://leica-users.org/mailman/listinfo/lug for more information >