General Information

Serial #

N/A

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

SYNTHETIC

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

8.2 cm

Width

7.4 cm

Height

N/A

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Photography

Category

Cine camera accessories

Sub-Category

N/A

Manufacturer

AKA

Unknown

Country

England

State/Province

Unknown

City

Unknown

Context

Country

Canada

State/Province

Unknown

Period

Probably used in the late 1950s.

Canada

Unknown

Function

A device used to calculate the correct camera lens opening for a proper exposure depending on light available.

Technical

One of a series of Johnson plastic disc type calculators for use in determining exposure under daylight condition for all types of still and cine colour reversal films. Weather conditions and seasonal variations in lighting are considered. The calculations were compiled in accordance with the British Standards exposure tables BS935 and applies to latitudes 45-degrees to 55-degrees north, but correct light value tables for other latitudes were supplied for pasting over the standard values. (Ref. 1)

Area Notes

Unknown

Details

Markings

PRINTING INCLUDES: 'JOHNSON COLOUR & CINE CALCULATOR/ FOR REVERSAL FILMS'/ [SEE IMAGE BANK FOR DETAILS]

Missing

N/A

Finish

CREAM WITH BLACK AND RED PRINTING

Decoration

N/A