Lens-set

Rathenow Optische-Industrie Anstalt vorm. Emil Busch

Comprises:

Unicum two-blade shutter speeded 1 - 1/100, B,T
Iris diaphragm marked Bis-Telar to f45 and f64 for Detective Aplanat
f6, 5" Detective Aplanat No. 2
f9, 9" Bis-Telar telephoto No. 2
Fitted case for Bis-Telar

For quarter-plate.

Serial no. 106365.

3865, 36040 , Bis-Telar is marked 36040.

The Detective Aplanat was a fast rapid rectilinear using Jena glasses.

BJA 1900, p. 430. BJA 1907, p. 417.