Triple Achromat
1860
J.H. Dallmeyer
London
England
f10, 7" back focus
Lens Type:
Triplet. 69° angle of view.Waterhouse stops. Brass mount. 7" back focus. 1 ¼" front lens diameter. For 5" x 4".
Serial Number:
3642 (c. 1862) .f10, 9 ½" back focus
Waterhouse stops. Brass mount. 9 ½" back focus, 1 ½" front lens diameter.
Serial Number:
21904 .f10, 10 ¼" back focus
Waterhouse stops. Brass mount. 10 ¼" back focus. 1 ⅝" front lens diameter, 2 ⅛" back lens diameter. For whole-plate.
Serial Number:
13611 (c. 1867) .No. 2. f10, c. 11"
Waterhouse stops. Brass mount. 1 ⅝" front lens diameter, 2" back lens diameter. For whole-plate.
Serial Number:
69732 , (c. 1906).The Triple Achromat was introduced in August 1860, it gave a flat field and some correction for astigmatism. It proved very popular and was supplied on many Dallmeyer cameras.