Typical usage of G1 camera, be it in the role of automatic guider
or Moon and planetary imager, requires placing of the camera into
telescope focuser instead of normal 1.25 inch
eyepiece. But there are optical systems not equipped with such
interface—typically photographic lenses or
special devices like focal reducers, field correctors, filter wheels,
flip-mirror systems etc. To eliminate problems with attaching of G1
cameras to such system, new interface element was designed to mimic
large camera (G2 and G3 series) front mounting plate on small G1
G1 camera with T-thread adapter attached
Interface element is designed to preserve back focal distance of
all used adapters. This mean it is possible to properly focus all
lenses with particular bayonet or thread (Canon EOS, Nikon F, Pentax
thread, T-thread, ...).
The interface is not designed only to thread into C-thread on the
camera side. It is attached instead of original CS mount to provide
robust connection and to maintain proper adapter orientation. The
minus side is the interface element is not user-replaceable. G1 camera
must be ordered with standard CS mount or with G2/G3-like interface.
It is also possible to replace the adapter later, but camera must be
returned to manufacturer for this operation.