Edmund Optics

Focal Length Calculator

Focal Length Equation

Relate optical and mechanical parameters of simple lenses in order to ease integration into application assemblies. Select index from list of EO's own optical substrates to help calculate focal lengths and principal points of any standard lens.

OR Plano 

OR Plano 

Effective Focal Length, EFL (mm) --       
Back Focal Length, BFL (mm) --       
Front Focal Length, FFL (mm) --       
Primary Principal Point, P (mm) --       
Secondary Principal Point, P'' (mm) --       
Shift in Nodal Points (mm) --