[pure-silver] Re: Formula needed
- From: BertS <aasainz@xxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Sun, 26 Sep 2004 20:38:09 -0400
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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