Archived posting to the Leica Users Group, 2005/11/14
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]The movement is totally parallel to the axis of the lens. The FOV is therefore displaced by the same amount, relative to the optical axis. Therefore the displacement or error is 2.5mm in the FOV. Now I probably need to go look at my Geometry books ( and associated trig tables) but I would agree with you that to get the 100% correct FOV using Parallax correction, you would need to adjust something to account for the 2.5mm. I will accept your 0.14 degrees... However... being a practical person, 2.5mm is 1/10 of an inch of error in a FOV that might measure maybe 8x10 inches at closest focus.... so the error is so small that it account for basically nothing, becasue your FOV in a RF camera is never 100% anyway... Go get a SLR if you want 100% framing, and be fussy which one you choose.....I remember the Nikon F was 100%. I forget what other had that degree of accuracy. Or go cheap... crop. Chop of the head at 3 feet using this kind of error? I doubt it. You might miss a few hairs..... Frank Filippone red735i@earthlink.net I may have overstated the problem, but I look at it like this: By my measurement, there is approximately 59mm between the viewfinder axis and the lens axis on a IIIf. Hence, on a IIIf, the VF must be deflected downward by 3.38 degrees, using the paralax adjustment, in order for the VF field of view to correspond to the lens field of view at 1 meter. If the VF is raised another 2.5mm, the VF needs to be deflected downward an additional 0.14 degrees. Although the change is small, one could chop off the top of heads because of this when shooting at close distances. Jim Nichols Tullahoma, TN USA