Multifex
1903
R & J Beck Ltd
London
England
No. 3
Lens Type:
Telephoto. Variable separation.Iris diaphragm scaled 1 - 64. Magnification scaled 3 - 6. Brass mount. For whole-plate. The positive lens - engraved Multifex Positive Lens - is removable and can be used as a prime lens. A magnification of 3 gave a focal length of 22.5" at f22, a magnification of 6 gave a focal length of 45" at f45.
Serial Number:
54775 .
References & Notes:
BJA 1905, p. 172. BJA 1907, p. 150. Phot. Lenses Simple Treatise 5th ed., p. 288.Staley-Wheeler Convertible Telephoto
1907
A.E. Staley & Co.
London
England
Lens Type:
Telephoto attachment. Variable separation.Brass mount with rack and pinion movement. Scale marked 0 - 50 mm. One negative component is missing.
Designed
by Captain Owen Wheeler, the negative group consists of three components that could be used separately or in conjunction giving a range of magnification up to 30x. Two sizes were made for quarter and half-plate, later only the half-plate is advertised.
The patent shows the three groups each having two elements, the focal lengths given are: B 65 mm; B1 30 mm and B2 50 mm. Later diagrams still show three groups but with different element configurations.
References & Notes:
BP 18121/1907. BJA 1908, 1194. BJA 1909, pp. 549, 705. BJA 1912, p. 7. N&G 1911, p. 89.Holos Telephoto Attachment
c. 1903
W. Watson & Sons
London
England
Lens Type:
Telephoto attachment. Variable separation.Brass mount with sliding movement. Scale marked 2x - 3x.
Format:
For 4" x 5" images.Serial Number:
798 .With:
- f6.5, 5 ½" Holostigmat, iris diaphragm to f64. Comprises: 8 ½" back group, 10 ½" front group. Serial no. 803.