Optical calculators
Calculate field of view, entrance pupil diameter, sensor Nyquist frequency or the sag of an aspheric surface.
Horizontal field of view calculator
Find the full horizontal angle from the active sensor width and lens focal length.
Sensor Nyquist frequency calculator
Convert pixel pitch in micrometers to the image-plane sampling limit in line pairs per millimeter.
Entrance pupil diameter calculator
Calculate entrance pupil diameter from effective focal length and nominal f-number at infinity focus.
Even asphere sag calculator
Calculate the axial sag of a rotationally symmetric surface at one radial height. The result includes the base conic and each enabled even-power term.
Offline tools
Aspheric Sag Batch Toolkit
Calculate rotationally symmetric asphere sag at multiple radii in an offline Python workflow and save the results as CSV.