Archived posting to the Leica Users Group, 2000/07/12

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Subject: Re: [Leica] Stupid question!!!
From: Martin Howard <howard.390@osu.edu>
Date: Wed, 12 Jul 2000 19:08:44 -0400

John Hoang jotted down the following:
 
> Would someone explain to me what is horizontal and vertical rangefinder
> misalignment. How can I find out mine is misalignment? And how it will
> affect picture taking. Many thanks.

In short, RF misalignment is when either the two images do not converge at
all (usually in the vertical), or when they converge at an incorrect setting
(usually horizontal).  In other words: vertical misalignment manifests
itself as the two coincident images being slightly offset vertically.  This
may be annoying, but it doesn't affect focus accuracy (other than if it
becomes too distracting to see properly).  Horizontal misalignment occurs
when the images coincide, but the resulting image at the film plane is out
of focus.  This is most easily (only?) detectible at infinity: Focus the
lens at something at least two miles off.  If the images in the RF patch do
not align perfectly, then there is horizontal misalignment.  Obviously, this
type *will* affect focus, and requires fixing.

How to fix horizontal alignment has been dealt with in the past on this
list, and serves as an excellent opportunity to exercise the curious
person's skills at handing the list archive engine ;)

   http://mejac.palo-alto.ca.us/leica-users/

M.

- -- 
Martin Howard                     |
Visiting Scholar, CSEL, OSU       |  All wiyht. Rho sritched mg
email: howard.390@osu.edu         |  kegtops awound?
www: http://mvhoward.i.am/        +---------------------------------------