Archived posting to the Leica Users Group, 2011/04/12
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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