downloads .....
Last updates:
January 2024: The Exposure article has been re-written and simplified.
SIGMOID MODEL DOCUMENTS 2024
Sample spreadsheet files are available below. Purchasers of the photometer will be sent the full
suite of spreadsheets and programs by email.
Enlarger Photometer
Document :- enlarger_photometer_14_2_20190205.pdf
Enlarger Photometer
Sample File film_id11b_v13_5pl_12_1_20240111_sample.ods
APPLICATION OF FILM DATA DOCUMENTS
Exposure application document, 20240129
7 Step Test Chart Spreadsheet, ods version
7 Step Test Chart Spreadsheet, xlsx version
ISO and effective film speed document
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
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 Reflection 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