Re: finders - hacking solutions anyone?

[simon nathan <simonwide@xxxxxxxxxxxxx>]

do you know an elephant is? it's a mouse built
to govt specifications. simon nathan

Les Newcomer wrote:

I would think a simple protractor would suffice.
A. Locate the rear peep sight, pin, etc.
B. Drop a drugstore protractor with the vertex at the pin
C. mark the dimensions for the angle of view for your particular
camerera/lens

The marks are where the verticals should be. Since distance between the two
marks will probably not be the same as the film, the distance between  the
horizontal parts of the wire will have to be adjusted in accordance with the
aspect ratio.

GAPiccagli@xxxxxxx wrote:

> In a message dated 8/29/00 11:07:50 AM, rsage@xxxxxxxxxxxxxxxxxxxx writes:
>
> << 1) Homemade wire-frame non-optical viewfinder with rear sight and front
> frame that may even fold down out of the way. >>
>
> An interesting idea. I'm wondering what the design parameters are:
> 1) front part of the finder should have the aspect ratio of the format
> 2) rear part should operate to center the eye,
> but how is the distance between front and back related to
> a) the focal length of the objective, and
> b) the dimension of the front opening?
>
> Anybody have a cache of formulas to keep us from having to think too hard?
>
> Thanks.
>
> Wide Giorgio
> Expansively in San Francisco