ExpoDev screen

BTZS ExpoDev for iOS

BTZS ExpoDev for iOS enables you to use BTZS Film Profiles to accurately calculate B&W film exposures in the field for consistently exposed negatives that are easier to print in the darkroom.

Available on iTunes

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Plotter App

BTZS Plotter for Windows

BTZS Plotter for Windows is a graphing and analysis program for photographers who are interested in investigating the characteristics of their black-and-white films, papers, and developers.

Available on TinyOctopus Store

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