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 Except China

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


Langxin (Suzhou) Precision Optics Co., Ltd
1st floor, Building 10, Yisu Science and Technology Innovation Park, 100 meters west of the intersection of Xinhua Road and Weimeng Road, Kunshan City, Suzhou City, Jiangsu Province, 215345

Telephone: +860512-57284008
Contact: Wang Zengkun

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Mersenne Optical Consulting


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Optical Perspectives Group, LLC

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