G3 Camera Overview
G3 camera head is designed to be easily used with a set of accessories to fulfill
various observing needs. Camera head itself is manufactured in two different
variants:
●
Camera with internal filter wheel with 5 positions for 2” or D50 mm
filters.
●
Camera with control port for external filter wheel. This model allows
attachment of an external filter wheels with with 7 positions for 2” or
D50 mm filters.
The whole system comprises of various telescope adapters, which can be
attached to all variants of camera heads – without filter wheel, with internal
filter wheel or with external filter wheel.
Let us note that it is not possible to combine both internal and external filter
wheels. The external filter wheel reuses the control electronics, which stays idle
if the camera is not equipped with internal filter wheel. This solution eliminates
separate power and control cables for the external filter wheel, as it is attached
to the camera head. It also brings full software compatibility, as the software
does not distinguishes internal and external filter wheels, only the number of
available filters is different.
All telescope adapters, which preserve defined back focal distance (BFD –
typically bayonet adapters for photographic lenses but also the OAG adapter),
are designed for the external filter wheel BFD. If they are used on the camera
with internal filter wheel or without a filter wheel at all, it is necessary to use
spacers. Thin spacer compensates BFD difference between external and
internal filter wheel and thick spacer adds the thickness of the external filter
wheel housing to keep the BFD on camera without filter wheel.
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