other camera manufacturers followed with their own behind-the-lens meter camera designs in order to compete in the marketplace. 35mm slr film cameras such as miranda with their miranda sensomat, unlike most other systems used a behind-the-lens meter system built into the pentaprism itself. other miranda 35mm slr cameras could be adapted to behind-the-lens capability through the use of a separate pentaprism which included coupled or non-coupled built-in cds meters. miranda had a second lens system, consisting of the sensorex models which had an externally coupled auto diaphragm. sensorex camera bodies had built-in meters and these evolved to include ttl and 'ee' capability.