[Leica] 6bit coding

[Frank.Dernie at btinternet.com (Frank Dernie)]

Hi Frank,
it is not the depth of field which is important for the focussing register, 
but the focussing travel. The importance of mount precision gets greater 
with wide angle lenses, not less, since a given axial error is a bigger 
proportion of the focus travel.
I am sure someone on the list has the data but IIRC the axial focus travel 
for a given change in distance is proportional to the focal length, so a 
21mm is about 2.5 times -more- sensitive to an axial error than a 50mm lens.
cheers,
FD

On 25 Nov, 2010, at 18:35, Frank Filippone wrote:

> It made no difference to my 21.... but then again, my DOF is a "bit" more
> relaxed.....