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Unidentified · Astronomy

This is a brass lens or eyepiece. The tube of this lens is quite narrow, with flared ends, one of which is much broader than the other. At the smaller end there is a small pinhole opening. At the wider end, there is a threaded attachment and a convex lens.

Accession Number: 2018.ast.89

Alternative Name:

Primary Materials: Metal: Copper Alloy, Glass

Markings: None.

Dimensions (cm): Length = 5.6, Diameter = 4


This is an attachment for an optical instrument.


Fair: The metal surface of the lens is in excellent condition, with a few small scratches and nicks. The threads of the screw do show some signs of wear from use. The glass of the lens is very dirty, and seems to have white flecks across the surface and in the interior of the lens, making the lens seem very cloudy.

Associated Instruments:


Date of Manufacture: Early 20th Century


This object was likely moved from the David Dunlap Observatory in Richmond Hill in 2008, upon the sale of the observatory. It was stored at the Department of Astronomy and Astrophysics until 2017, when it was moved to a new storage location in McLennan Physical Laboratories.

Additional Information and References:

Historical Notes: