Johnson's - Antique and Vintage Cameras

Johnson's Exposure Calculator

Standard

c. 1946

Johnson & Sons Ltd

London

England

Image of Johnson's Exposure Calculator

Meter Type:
Calculator.

Calibration:
Film speed: 14 - 26 BSI, 24 - 36° Scheiner. Shutter speed: 1/1000 - 16s. Aperture: f1.4 - f22.

Attributes:
Settings for - Time of day, time of year. Weather conditions. Type of subject. Filter factor settings.

With:
Envelope.

Standard

c. 1947

Meter Type:
Calculator.

Calibration:
Film speed: 22 - 34 BSI, 23 - 35° Scheiner. Shutter speed: 1/1000 - 16s. Aperture: f1.5 - f22.

Attributes:
Settings for - Time of day, time of year. Weather conditions. Type of subject. Filter factor settings.

With:
Instructions.

Standard

c. 1947

Meter Type:
Calculator.

Calibration:
Film speed: 22 - 34 BSI, 23 - 35° Scheiner. Shutter speed: 1/1000 - 16s. Aperture: f1.5 - f22.

Attributes:
Settings for - Time of day, time of year. Weather conditions. Type of subject. Filter factor settings.

With:
Instructions.

Artificial Light

c. 1948

Meter Type:
Calculator.

Calibration:
Film speed: 14 - 26 BS, 21 - 36° Scheiner. Shutter speed: 1/1000 - 16m. Aperture: f2 - f16.

Attributes:
Settings for - Type of bulb (watts). Distance of lamp to subject. Angle of light. Type of subject.

Artificial Light

c. 1948

Meter Type:
Calculator.

Calibration:
Film speed: 19 - 34 BS, 20 - 35° Scheiner. Shutter speed: 1/1000 - 16m. Aperture: f2 - f16.

Attributes:
Settings for - Type of bulb (watts). Distance of lamp to subject. Angle of light. Type of subject.

With:
Instructions. Envelope.

Flash

c. 1954

Meter Type:
Calculator.

Calibration:
Film speed: 22 - 34 BSI, 12 - 200 ASA, 23 - 35° Scheiner. Shutter speed: Open flash, 1/25 - 1/1000. Aperture: f1.5 - f22. After making the settings a scale shows the aperture to use for various distances.

Attributes:
Settings for - Type of bulb. Distance, 2 ½' - 80'.

With:
Envelope.

The first of these appeared in 1945, they was essentially a re-introduction of the Ensign Posometer. At the time they were known as dial calculators, i.e. the disc was moved by notches rather like a telephone dial. The first model was for outdoor use and called the 'British Standard'. The name referred to the British Standard of 1941 on which the calibrations were based. Soon after the name was changed to 'Standard'. The largest aperture was f1.4, later this became f1.5. Around 1948 a model for artificial light was introduced followed in 1954 by a model for flash exposures. In 1957 a 'Colour and Cine' version appeared, this had a slightly different shape to the others. By 1960 the other meters also adopted the new square-top shape.

References & Notes:
BJA 1946, p. 186. BJA 1947, p. 46. BJA 1949, p. 56. BJA 1950, p. 235. BJA 1955, p. 264. BJA 1958, pp. 57, 239.


Company Details:

Johnsons of Hendon

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