tray with optical filters
Date: 1950-1990
Inventory Number: 2004-1-0116
Classification: Filter
Subject:
User: Edwin H. Land (1909 - 1991)
Maker: Eastman Kodak Company (1881-present)
Cultural Region:
Dimensions:
filter box: 4.6 × 17.9 × 32.9 cm (1 13/16 × 7 1/16 × 12 15/16 in.)
each filter: 8.4 × 6 × 0.2 cm (3 5/16 × 2 3/8 × 1/16 in.)
Description:
Neutral density and color filters for projectors. Most likely Wratten filters made by Kodak. Tray of 55. The filters' frames have two holes, fitting the two prongs found in front of the slide projectors lenses (see 2004-1-0159a, 2004-1-0161a and 2004-1-0211). Most of the filters have markings (Wratten numbers or other inscriptions, like "diff grating").
Signedunsigned
FunctionUsed by Land for his experiments with color vision (Retinex theory).
ProvenanceThis object belonged to Edwin H. Land and came from the Rowland Institute, Harvard University. Gift of the Edwin H. Land Family.
