Re: [Leica] Focusing on a plane

[henry <henry@henryambrose.com>]

rei,  (shino@ubspainewebber.com) 
wrote asking about an * ACTUAL PHOTOGRAPIC * issue while many on this 
list were bitching about various trivial subjects:

Here's the answer. Sorry it could not have some sooner, but I was out 
making pictures. Imagine that!!!!

When you focus on the object  at "R" all you need to do is pivot the 
camera around a point in the center of the film plane as you recompose. 
When you do it that way the camera to plane of focus distance remains 
just as it was before you moved and your subject at "R" is still in focus.

Its not an issue.

Focus, pivot the camera, push the button.

Simple.

Henry
>
>sometimes, i take a photograph using the rangefinder like a spot focus
>meter.  for example, using the diagram below, i might take a photo where
>C is at the center, but i am focusing on R.  
>
>(use constant width font)
>
>      --------C'-------
>      -L------C------R-
>        \     |     /
>         \    |    /
>          \   |   /
>           \  |  /
>            \ | /
>             \|/
>              M6
>
>with a rangefinder, i might focus on R by pointing the camera to R using
>the rangefinder, and then recompose, so that C is again at the center.
>
>but now, i was thinking, isn't the distance RM6 greater than CM6?
>and therefore, the plane of focus be behind R, such as the plane passing
>through C'?
>
>i suppose this would only be an issue with wider angle lenses.
>
>-rei
>
>--