GAMMA represents a high standard of photography and membership is by invitation of the members.

Membership is expected to be granted only to those photographers with a high level of commitment who have proved themselves in the practice or promotion of photography through exhibitions, publications or the production of new ideas in image creation and presentation.

Members are expected to make presentations of work, either in finished or work in progress format, at least once every two years. During such presentations other members will seek to discuss the work in a friendly and constructive manner as part of the learning,development and mutual support process.