GPd definitions

GPD

Generic Printer Description / Gallons Per Day, details ......
Found on http://www.cryer.co.uk/glossary/g/index.htm

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GPD

Gallium Photo Diode. Metering cells for measuring exposure, using gallium arsenide-phosphide, just like SPD or Cds cells.
Found on http://www.rodsmith.org.uk/photographic%20glossary/rods%20photographic%20gl

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