Specifications

connected. Standard 2" barrel adapter allows camera connection to vast

majority of astronomical telescopes.

2" barrel adapter can cause vignetting (partial shielding of detector corners),

especially if a fast optical systems is used with the G3-11000 camera with

24×36 mm CCD detector. Also T-thread (M42×0.75) or Praktica (M42×1)

adapters cause even bigger vignetting. G3 cameras can use threaded adapter

with 2.156-24UN thread, designed for TeleVue Paracorr PSB-1100 coma

correctors (thread diameter is approx. 55 mm). Standard adapters for Canon

EOS or Nikon do not cause vignetting even with large chip.

Illustration 12: G3 CCD camera connected to telescope focuser

Photographic lens or some small refractor is the best optical system to start

experimenting with the camera. If you are using some bigger telescope at

home for the first experiments, make sure the telescope can be focused to

relatively nearby objects in the room.

It is better to start experimenting at night, because it is very easy to saturate

the camera at daylight. The shortest exposure of G3 or G4 cameras is

around 0.25 s, which can be too long at daylight conditions.