CaliBall™ II


A horizontal interferometer calibration device.

Learn more about the history of the CaliBall™ by downloading the PDF below.

Download PDF


The CaliBall II is used in horizontal interferometer set ups and is held in a Zygo type 4” bayonet mount that provides the adjustments to align the CaliBall II to the transmission sphere.

Details of the CaliBall™ II package:

The CaliBall™ II comes with all the same components as CaliBall™ I but it is better suited for use with horizontal looking interferometers that are equipped with a Zygo style 4” bayonet mount with x-y-z adjustments
CaliBall™ II does not need a separate x-y-z mount because the bayonet mount performs this function
The Random Ball Test* has been reviewed in papers by authors at both NIST and CSIRO who conclude they are not aware of a better method of transmission sphere calibration.
(See papers about the Random Ball Test under Technical Papers)

*The Random Ball Test is not reliable for calibrating transmission spheres slower than about f/7.

Disclaimer: All specifications and prices are subject to change.

Worldwide Representatives


Armstrong Optical
+44(0) 1604 654220

All Asian Countries

清 原 耕 輔   Kosuke Kiyohara
清原光学 営業部   Kiyohara Optics / Sales

Kiyohara Optics Inc.
3-28-10 Funado Itabashi-Ku Tokyo, Japan 174-0041

Australia & New Zealand

Mersenne Optical Consulting

Optical Perspectives Group, LLC

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