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All software available from this site, namely Photo Calculator for Windows and Mac, as well as the Sun & Moon Calculator are free.
Just install the latest version over your existing version

The Benefits of a Grey Card

Find out more about grey card and the benefits it can have in photography, including White Balance and Exposure Measurement. See our Benefits of Grey Card article.

Depth of Field

What is depth of field within photography? Find out more with our Depth of Field in Photography article.