Darlot Opticien (Paris, France)

 

Darlot View Lens (single achromat) Variation 2
(straight barrel, rotating stops, lens hood),  c. 1890's

 

Type 1 - lens hood is a separate piece; it has a larger diameter than the barrel and screws in.

 

Type 2 - lens hood is the same diameter as the barrel and is not a separate piece of the lens.
 

Notes:  This lens is marked Darlot and is a single achromat, but does not seem to be advertised in any of the catalogs herein.  This is a typical single achromat, where the largest  aperture useful for photography is considerably smaller than the diameter of the glass, as the fixed aperture visible in the straight-on photograph shows.  Smaller apertures can be selected via a rotating wheel.  It is presumed that the example above in which the lens hood is a separate piece is the earlier form of the lens.

References:

 

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