b-w technik

Low Cost Darkroom Techniques

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All information is now Version 13.2 and 14.2 with the introduction of gradient G2, constant agitation and Effective Film Speed.

SIGMOID MODEL DOCUMENTS

Sample spreadsheet files are available below. Purchasers of the photometer will be sent the full suite of spreadsheets and programs by email.

1. Enlarger Photometer Document :- enlarger_photometer_14_2_20190205.pdf

2. Enlarger Photometer -Sample File :- enlarger photometer spreadsheet 2-14_2.ods

3. Enlarger Photometer -Sample File :- enlarger photometer spreadsheet 2-14_2.xls


APPLICATION OF FILM DATA DOCUMENTS

4. Exposure application document, 20180927

5. ISO and effective film speed document

6. Contrast sensitivity notes, 20180516

RAW CHEMICALS LIST AND SUPPLIERS

This relates to the formulae page. It includes suppliers offering small quantities of chemicals that have been checked for photographic use.

Raw Chemicals List and Suppliers    Formulae and Notes


Various Articles from the 1960's onwards giving historical background information
Current Exposure Meters
Calibration Levels of Films and Exposure Devices
Contrast Index
Contrast Measurements of Black and White Materials
Defining K
Description of H-D Curves by Specifically Chosen Parameters
Emulsion Speed Rating System
Exposure For the Middle Tones
Factors Affecting the Quality of Black and White Relection Prints
Re evaluation of Factors Affecting Camera Exposure
Safety factors in Camera Exposure
Simple Methods for Approximating the Fractional Gradient Speeds
Speed Relations and Tone Reproduction - 05.03.2014
Tutorial - A Review of Speed Methods