Darlot Opticien (Paris, France)

Darlot Hemispherique Rapide / Rapid Hemispherical Lens, c.1880's-c.1900


Catalogue No. 7, T.F. Indermill, (St. Joseph, MO), 1 Oct 1885, p. 88



 


Notes: 

This lens is basically a rapid rectilinear design, having a cemented achromat doublet in front and another in back.  It is quite distinctive with its push-pull focus and set screw.  The slot in the barrel into which its Waterhouse stops slide is exposed by pulling the lens out.  Once the stop is fully in, the lens is pushed back in and the collar fits over the stop to hold it in place.  For this purpose, the stops are uniquely shaped, being round on the bottom with a triangular section on top tapering to a small tab at a right angle to the stop.  Morrison Wide Angle Lens Variation 2 also has such a stop system.

This lens does not appear to have been advertised amongst the apparently full range of Darlot lenses in the Illustrated Catalogue Issued Annually by Thos. H. McCollin, Thos. H. McCollin (Philadelphia, PA), January 1, 1876, pp. 10-16.  It may therefore have been introduced between 1876 and 1882.  From the number of this lens remaining on cameras of the era, it appears to have been a fairly common lens in the U.S.A.
 

References:
The Photographer's Friend, Richard Walsl (Baltimore, MD), 7th edition, 1882, p. 40
The Photographic Times and American Photographer, Vol. XIV, No. 171 (New Series No. 51), J. Trail Taylor, ed., Scovill Mfg. Co., pub., NY, December 26, 1884, ads page 12
Scovill's Photo. Series No. 1, The Photographic Amateur, 2nd Edition, J. Traill Taylor, Scovill Mfg. Co. pub. (New York, NY), original copyright 1883, 2nd Ed. about 1885, ads p. 26
Catalogue No. 7, T.F. Indermill, (St. Joseph, MO), 1 Oct 1885, p. 88
How to Make Photographs and Descriptive Price List, Scovill Mfg. Co. (New York, NY), distributed by Andrew J. Smith (Providence, RI), 1886, p. 54
Illustrated Catalogue of Photographic Apparatus, C.H. Codman & Co. (Boston, MA), June 1886, p. 26
Scovill's Photo. Series No. 12, A Manual of Photographic Chemistry, Scovill Mfg. Co. (New York, NY), 1886, ads p. 34
Scovill's Photo. Series No. 20, Dry Plate Making for Amateurs, Scovill Mfg. Co. (New York, NY), 1886, ads p. 26
How to Make Photographs and Descriptive Price List, Scovill Mfg. Co. (New York, NY), distributed by C.H. Codman & Co. (Boston, MA), April 1887, p. 59
How to Make Photographs and Descriptive Price List, Scovill Mfg. Co. (New York, NY), distributed by C.H. Codman & Co. (Boston, MA), 1888, p. 56
How to Make Photographs and Descriptive Price List, The Scovill & Adams Co. (New York, NY), Jan 1889, p. 54
How to Make Photographs and Descriptive Price List, The Scovill & Adams Co. (New York, NY), distributed by Horgan, Robey & Co. (Boston, MA), June 1891, p. 53
How to Make Photographs and Descriptive Price List, The Scovill & Adams Co. (New York, NY), distributed by Horgan, Robey & Co. (Boston, MA), January 1892, p. 55
Catalogue of Photographic Apparatus, Rochester Optical Co. (Rochester, NY), May 1897, p. 75

 

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