Basic lens calculators

Basic lens calculator: 1/u + 1/v = 1/f

Object distance (u)
Focal length (f)
Image distance (v)

Lamp lights when calculation is valid.
Magnification (v/u): 

Lens combination calculator: 1/f1 + 1/f2 = 1/F

Lens 1
Lens 2
Combination

Focal length (mm)

Dioptres
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The Imaginatorium
© Brian Chandler 2000-01
Extract from "Close-up filter" page

Popup version created December 2001 - WDG validated