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Optical Testing
COS made interferometric testing techniques more accessible to the astronomical community, both professional and amateur. The introduction of the Ceravolo interferometer, and kit components required to construct it, made long path difference interferometry accessible to many small optics shops and amateur telescope makers. COS also popularized the Ross null test for testing telesope mirrors. Our precision Reference Element and Ross null lens are back by popular demand.
Laser interferometry booklet Interferometry and Telescopes
Learn how to build your own interferometer and use it to test telescope optics.
Interferometry reference element lens Reference Element
Back by popular demand! The COS spherical wave interferometer reference element.
Ross null lens for mirror testing Ross Null Lens
Time to toss out that zonal mask! The Ceravolo Ross Null lens eliminates the spherical aberration of a telescope mirror when tested at the center of curvature.
Using the Ross test Using The Ross Null Lens
To learn how to perform mirror testing with the Ross Null lens, view or download this PDF document.