A Johnson flash calculator.
Johnsons of Hendon Ltd.
Category
Photographic technology
Date
1950 - 1955
Materials
Plastic
Measurements
65 mm (Diameter); 3 mm (thickness)
Place of origin
Hendon
Collection
Fox Talbot Museum, Wiltshire
NT 1525570.2.1
Summary
A Johson flash calculator. It is white plastic and is a disc which rotates within a casing. Film speed rating and flash bulb type is set. Distance to the subject reads off the scale On the front a label says ' Johnsons Flash Exposure calculator'. Apertures range f1.5 to f22 and shutter speeds 1/25 sec to 1/1000 sec. Outline instructions are printed on the front and weather and lighting conditions are categorised on the rear.
Provenance
Donated on 1/08/2016 to The Fox Talbot Museum by Mr A E Burch.
Makers and roles
Johnsons of Hendon Ltd. , manufacturer