[Leica] Viewfinders and the 2.5mm

[jhnichols at bellsouth.net (Jim Nichols)]

Frank,
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