The ABFO No. 2 Archaeology Photo Scale

The ABFO No. 2 Photo Scale

CODE: ARCHPHOTO0007

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THE ABFO NO. 2 ARCHAEOLOGY PHOTO SCALE

This scale has become the standard for measurement and photography on sites in the USA. The incorporation of three circles is useful in helping to compensate for distortion resulting from oblique camera angles. Graduations are all metric except for the width of the legs, which are 25cm wide.

The 1cm division lines are traced and extended across the photographic print to grid an image. Measurements within the image are then made relative to these inscribed 1cm grid lines to compensate for any distortion resulting from non-parallelism between the film and the object planes. The plastic is designed not to reflect photographic flash and reduces glare on the photograph.

Specifications:

Overall size is 105mm x 105mm
Gray areas have a reflectance value of approximately 18%
Alternating black and white bars (1cm) permit measurements from grossly over and under-exposed photographs
Rigid, 1mm thick L-shaped laminated plastic
Millimeter markings accurate to 0.1mm or better


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