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Spectral response of J Lane Speed Plate orthochromatic emulsion

20/6/2021

Comments

 
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. 




Picture
Picture

Scan of J Lane Speed plates shot unfiltereD at ASA 25.

Picture

Scan of Plate shot with yellow filter and +4 stops compensation

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    I'm the guy behind the curtain, Jason Lane, coating plates instead of sleeping.

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