# [pure-silver] Re: Formula needed

*From*: Nick Zentena <zentena@xxxxxxxxxxxx>*To*: pure-silver@xxxxxxxxxxxxx*Date*: Sun, 26 Sep 2004 19:09:54 -0400

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 ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.

**Follow-Ups**:**[pure-silver] Re: Formula needed***From:*Nick Zentena

**References**:**[pure-silver] Formula needed***From:*Stein

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