Optical design reference
Look up an optical term, trace a starting design or calculate a lens parameter for your camera.
Horizontal field of view39.60°
36 mm sensor width · 50 mm focal length↗
Optics encyclopedia
Look up the quantity, see the equation and work through an example with units.
Lens starting designs
Rebuild a simple optical layout from its dimensions and compare your ray heights or focus positions with the reference values.
Optical calculators
Calculate field of view, entrance pupil diameter, sensor Nyquist frequency or the sag of an aspheric surface.
Engineering guides
Work through the decisions behind a calculation, from choosing the active sensor width to reading contrast on an MTF curve.