WYNNE'S Infallible Photographic Exposure Meter.
Wynne
Category
Photographic technology
Date
1893
Materials
Metal, Plastic, Felt, Paper
Measurements
10 mm (Height); 50 mm (Diameter)
Place of origin
Wrexham
Collection
Fox Talbot Museum, Wiltshire
NT 1525628.2
Summary
WYNNE'S Infallible Photographic Exposure Meter The correct exposure required for every speed of plate on every kind of subject, and under every condition of light. Calibration: Plate speed: F4 - F362 Wynne values. Shutter speed: 1/128 - 64m. Aperture: f4 - f362. Attributes: The plate speed and apertures share the same scale The Wynne pre-dates the Watkins Bee meter but did not achieve the popularity of that meter. Early models had no spring in the back of the case and are without the subject guide and orange cover that protects the sensitive paper. The subject table was added in the late 1890s. Around 1897 a small black segment was added to the cover glass to protect the sensitive paper prior to exposure. In 1898 the segment was replaced by an orange glass disc mounted on the cover glass. Around 1901 the tone of the grey tint and the sensitivity of the paper was changed. The new tint was included in packets of sensitive paper. In use the actinic value of the light is measured by the time taken for the sensitive paper to match the standard tint, the plate speed is set against this value. The shutter speed and aperture pairs can then be read on the two scales of the meter. https://www.etsy.com/uk/listing/595135538/wynnes-infallible-exposure-meter-c1900 When the exposure meter is opened there is a number on the inside underneath the spring – 890. There is a disc of red felt to hold the paper securely in place and for the spring to lean against when the exposure meter is closed. On the outside back is the following text – Exceptional subjects SEA AND SKY 1/10 NORMAL EXPOSURE DITTO WITH SHIPS ¼ SNOW SCENES ¼ WHITE SATURDAY ¼ LIGHT FOREGROUND ½ PORTRAITS NEAR CAMERA 1½ DARK OBJECTS DITTO 2
Makers and roles
Wynne, manufacturer