
Originally Posted by
Michael Nagl
Vinny,
what I discovered was that having the camera set up in front of a long faraway horizon - things farther away than 5 kilometres, so letīs say at "infinity" - what my 150mm lens produced was a sharp image on the left, and a blurred one on the right. Shifting focus from one edge to the other would require a movement of the film plane of about 3 mm or 1/8 inch. Note that the front standard was "zeroed", i. e. the groove on itīs lower side was resting on the rail. It showed that none the less a swing movement of about one or two degrees (roughly estimated) is possible, which affects the parallelity of film plane and horizon.
Bitter!
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