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 > ============================================================================================================= > 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. > 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 ============================================================================================================= 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.