Archived posting to the Leica Users Group, 2004/11/03
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I find that nearly all my pictures are tilted the same amount. Today while looking in my barbers mirror i found that i tilt my head and neck slightly. I postulate that is were the small tilt comes from. best simon jessurun amsterdam > That's an interesting number. If I did the math right, it works out to > about 0.025 degrees. So why is it so hard to level the camera with a > wide-angle lens? I suspect the answer is in the "minification" and > restricted field of view of the usual finders. Visual size reduction plus > shorter baseline equals greater error. The finder brightlines, if it even > has them, might easily be off by a degree, too. Without brightlines, > leveling is probably hopeless since your eye has no reference as to what > is square. > > Accurate reference lines in the finder are the only answer, as was > mentioned earlier this morning, but the the lines must be confirmed square > to the camera film gate, too. > > Photoshop is easier. How did we ever live without it? > > > > >>I had an interesting discussion with a cabinet maker and later with an >>Intensive Care physician several years ago about the ability of our >>"uncalibrated eyeballs" to discern "out-of-true" lines. Cabinet makers, >>I learned, have always known that the unaided human eye (assuming >>average eyesight), can detect 1/64" and 1/128" over a length of 3'. The >>physician was treating my wife, who had a Swan-Ganz (sp?) catheter. For >>the treatment to work properly, as I recall, a long level had to >>extended horizontally from the catheter entry site in her chest out to >>the side of the patient. Several nurses were fussing with the thing >>when the doc came in and, rather impatiently explained to the nurses >>that the human eye was more capable of detecting out-of-level conditions >>than by using the level. He then proceeded to demonstrate, and he was >>right! >>Amazing what the eye can do! >>Ken Frazier >> >>_______________________________________________ >>Leica Users Group. >>See http://leica-users.org/mailman/listinfo/lug for more information > > > -- > Regards, > > Dick > Boston MA > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information