1. A camera including: a body module including a body housing; and an image capture module, said image capture module being a sealed module and including: a housing; at least one image sensor to convert light into electrical signals, the at least one image sensor having an imaging plane; an optical system associated with the at least one image sensor and arranged to transmit light through the housing to the at least one image sensor; and a lens mount including a ring-like mounting face and a coupling to releasably engage an optical module to connect the optical module to the image capture module, wherein the at least one image sensor is mounted within the image capture module such that the imaging plane lies at a predefined distance from a plane of the mounting face of the lens mount; and a thermal interface through which heat is transferred from the at least one image sensor within the image capture module to the body housing of the body module to dissipate heat from within the image capture module; said image capture module being mounted directly or indirectly to the body housing, and interoperable with the body module to capture images.