[pure-silver] Re: Formula needed

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 mount 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.
> 
>      Thanks in advance.
> 
>      Uncle Dick
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1/f = 1/d1 + 1/d2 where f is the focal length, d1 is one of the two distances 
and d2 is the other distance.

Bert

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