Opal lamp
This is a filament lamp with an opal glass bulb for optimum diffusion.
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More Photographic Terms ...
Opal lamp is a filament lamp with an opal glass bulb for optimum diffusion.
Opalotype is an obsolete printing process in which a carbon-process image is transferred on to translucent opal glass.
 See also: Diffusion, Lamp, Filament, Bulb, Opaque
  
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