[pure-silver] Formula needed

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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