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I found some time to perform color rendition testing using J Lane Speed Plates. Metered at ASA 25, the rendition is similar to unsensitized plates but at a "more modern" speed. Drop a Yellow #2 aka K2 filter in front of the lens, add compensation time for the filter, and the orthochromatic response of the plate becomes evident. The bottom images of the MacBeth chart were shot in the test conditions shown in each caption. Development time was per Pictoriographica's standard recommendation. Both plates were scanned at the same time with the same settings. The plate scans were cropped, and coupled to the color versions of the chart. 
The following chart provides characteristic curve data for recent J Lane Speed Plates Orthochromatic ASA 25 emulsions. Correct exposure will be found by spot-metering on a gray card in mid-spring at mid-latitudes during mid-morning under northerly lighting conditions. See the Technicals and Tips Page for more detail on variations due to latitude, time of day, and time of year. The batch number can be found on the back of each box of plates in PURPLE TEXT  The following chart provides characteristic curve for J Lane Dry Plate ASA 2 Emulsion Batch # 53 and 54. Correct exposure will be found by spot-metering on a gray card in mid-spring at mid-latitudes during mid-morning under northerly lighting conditions. See Technicals and Tips Page for more detail on variations due to latitude, time of day, and time of year. The emulsion batch number can be found on the back of the box in PURPLE TEXT.  |
AuthorI'm the guy behind the curtain, Jason Lane, coating plates instead of sleeping. Archives
June 2022
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