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![]() ![]() Maker: General Electric Model: DW-49 Circa: 1940 Price (new): $22.00 Cell type: Selenium Measure type: combination Reflecting/Averaging, 2D Incident |
This is an earlier variant than my DW-58, because it has the older calculator hood. GE, like Weston, had their own film speed ratings before ASA became the standard. GE numbers (like Weston) follow the same geometric progression, but of course the base values are different. When ASA took over, GE sold replacement hoods with calculator dials calibrated for ASA (they say Expos. Index on them), but the ones that use GE numbers say "film values" somewhere on it. At least this one does. The DW-58, 68, the PR series and the Mascots came out after ASA became the industry standard. To convert ASA into GE, multiply the ASA index by 1.2 and you get the approximate GE equivalent. |