Optical metrology · Software development · Image processing

Optical metrology · Software development · Image processing

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Products > Optics Test Equipment > f-number measuring system

f-number measuring system


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Features and Application

The f-number of a camera objective is defined as the ratio of focal length f´ and the diameter of the effective entrance pupil.

The f-number measuring system serves for the automatic, software controlled measurement of the f-number of optical systems.

The setup consists of a stand with CCD camera and measuring optics.

The specimen is positioned on a back light illumination. The measuring lens is focused and takes an image from the free aperture of the specimen. The image processing software shows the image of the specimen in real time on the PC monitor. The software is calibrated and measures the diameter of the free aperture with high accuracy automatically.

The f-number is calculated from the measured diameter.


f-number measuring system