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According to John Reuter, a former Polaroid employee, only six cameras were built between 1976–78; five remain in use. [4] Tracy Storer clarified that two prototypes were built first, then using the lessons learned, five finished cameras were completed; famous artists and photographers were invited to use the cameras at the Polaroid studios on the condition that Polaroid was allowed to keep ...
Glass thicknesses typically range from 2.0 to 2.5 millimetres (0.079 to 0.098 in). Clear glass has light transmission of approximately 90%, absorption of approximately 2%, and reflection of approximately 8%. Whereas absorption can be reduced by using low-iron glass, reflection can only be reduced by an anti-reflective surface treatment.
Reproductions of antique gilded picture frame mouldings. The Professional Picture Framers Association / PPFA is an international trade organization serving the art and framing community worldwide since 1971. Members include independent frame shop owners and staff, distributors and manufacturers of picture frame mouldings, supplies and equipment ...
Optical glass refers to a quality of glass suitable for the manufacture of optical systems such as optical lenses, prisms or mirrors.Unlike window glass or crystal, whose formula is adapted to the desired aesthetic effect, optical glass contains additives designed to modify certain optical or mechanical properties of the glass: refractive index, dispersion, transmittance, thermal expansion and ...
In motion-picture cameras, the ground glass is a small, usually removable piece of transparent glass that sits between the rotary disc shutter and the viewfinder. The ground glass usually contains precise markings to show the camera operator the boundaries of the frame or the center reticle, or any other important information. Because the ...
Low-dispersion glass (LD glass) is a type of glass with reduced chromatic aberration, meaning the refractive index does not change as strongly with different wavelengths of light. In other words, the light passing through the glass has a smaller spread or dispersion between its constituent colors, resulting in a reduced " rainbow effect" at ...
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