Specifications

thread) cause vignetting with this large chip. E.g. TeleVue Paracorr PSB-
1100 with appropriate adapter must be used with KAI-11000 CCD.
If the mounting standard defines also back focal distance (distance from
adapter front plane to detector), the particular adapter is constructed to
preserve defined distance (for instance T-thread defines back focal distance
to 55 mm, but certain distance is defined also for Pentax (Praktica) thread,
for Canon EOS and Nikon bayonets etc.).
Adapters are attached to the camera body using four M3 (3 mm metric)
screws. These threaded holes are placed on the corners of 44 mm square.
Custom adapters can be made upon request. A nut with the same thread is
screwed
Telescope adapters for G4 cameras
The G4 cameras are supplied with standard M68×1 threaded adapter. This
adapter consists of two parts. The first part, attached to the camera head,
offers 4.5 mm long outer thread M68×1. The second part is a 12 mm thick
nut with inner M68×1 thread, screwed to the outer thread. So the user can
choose to use outer thread (without a nut) or 7.5 mm of inner M68×1 thread
(when the nut is screwed in). The back focal distance is of course longer in
the second case.
Illustration 8: M68×1 adapter for G4
camera with a nut
Only other option for G4 camera is Canon EOS lens adapter, all other
standards (2” barrel, T-thread, …) cause vignetting in the case of G4
cameras, because the detectors used measure 52 mm diagonally.
24