Bausch & Lomb Optical Co. (Rochester, NY)

Iris Diaphragm Shutter, 1891-type, Brass - c. 1900

Notes:  This is a Bausch & Lomb 6x8" Plastigmat (double anastigmat) lens in a 4" diameter brass Iris Diaphragm Shutter, patent date 1891, ser. #20900.

Illustrated Catalogue of Photographic Equipments and Materials for Amateurs, E. & H.T. Anthony & Co. (New York, NY), December, 1895, p. 77
Catalogue of Photographic Apparatus, Rochester Optical Co. (Rochester, NY), May 1897, p. 52
Catalogue No. IIII of Professional and Amateur Photographer's Supplies, Wm. F. Uhlman (St. Joseph, MO), c.1901, p. 21

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