Focometer is designed to determine the focal length of single and combined positive lenses up to 500 mm and negative lenses up to 500 mm, as well as the free aperture.

The clear aperture of the Collimator Objective is 25 mm. The collimator objective is corrected fulfilling the Rayleigh Criterion.

Model No.  FOCOMETER – 25
Measurement TypeEffective focal length (EFL)
Lens Aperture<50mm
Light source type (Light Source)COLLIMATED
Detectors (Sensors)High-Resolution Plane Type Sensors
Measuring range±3mm ±500mm
Resolution0.01 (arc sec)
Note: Different configurations are available upon request for special requirements to measure Decentration, Radius Curvature, Parallelism, Wedge plane, etc.