Abstract: An adapter may be used to couple an imaging device, such as a smartphone, to an optical device such as a telescope. The adapter may have an optical device mounting feature that mounts the adapter to the optical device, an imaging device mounting feature that mounts the imaging device to the adapter, and a positioning mechanism that adjustably positions the imaging device mounting feature relative to the optical device mounting feature. The adapter may also have a joint, distinct from the positioning mechanism, configured to move the optical device mounting feature between a stowed (e.g., “folded”) configuration, in which the optical device mounting feature is positioned alongside the imaging device support surface, and a deployed (e.g., “unfolded”) configuration, in which a camera of the imaging device is positionable, using positioning mechanism, in alignment with the optical device mounting feature with the imaging device mounted on the imaging device mounting feature.