[pure-silver] Re: Formula needed

On September 26, 2004 06:51 pm, Stein wrote:
> Dear Friends,
>      I am currently constructing a camera and need to know a formula for
> calculating the in-focus point for the main subjects. The camera has a
> fixed extension of 466 mm from the film plane to the lens mount. If I mou=
nt
> a 300 mm len with the nodal point just about at that 466 mm point, what
> will be the distance between the lens and the in-focus subject plane?
>
>     I know I have the formula somewhere but cannot find it.


=46rom "View Camera Technique"

1/focal length =3D 1/object distance + 1/image distance

So

1/300=3D1/object distance + 1/466

=46ormula claims 842mm. Which seems to close doesn't it?

Nick
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