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Black and White Photographic Film Sensitometry Techniques and Measurements


Practical sensitometry for black and white photography in the darkroom
Mathematical modelling of film characteristics
Simple programs for sigmoidal curve fitting optimised for film
Suggested new definitions for describing film characteristics
Modelling film and paper together
Fractional gradient measurements
Gradient loss in the shoulder region (for developers used at high dilution)
Dynamic range definitions and their practical use
Related exposure strategies
Simple photographic paper checks
Low cost enlarger densitometer

Dowsing Maps of the UK

This site is a long term project to map major earth energy lines across the UK and is updated as the work progresses. Any feedback is welcome.