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3.1.2.2 Installing the CIU
1. There is an alignment pin on the inside of the back end
of the 200mm lens. Align groove in the side of the CIU
with the pin, and slide the CIU into the 200mm Lens.
2. There is a silver alignment pin on the inside of the back
body adapter. Align this pin with the hole in the CIU
and secure the BBA to the 200mm Lens.
Silver Alignment Pin
Hole in
CIU
Groove in CIU Alignment Pin
3.1.3 Notes on Optimal Use
3.1.3.1 Nikon
The AstroScope 200mm Catadioptric Lens has a fixed aperture of
F1.3. Since there is no electronic communication between the
camera and lens, the camera’s automatic settings cannot be used.
However, the CIU includes an internal automatic gain control
feature so that a constant light output is maintained from the
intensifier for most light levels. Consequently, we recommend
adjusting the Nikon camera settings as follows:
1. Set the ISO to 1000 or higher. When using photographic
film, use high speed film only, ISO1000 minimum
2. Set the camera to “Manual Exposure” mode.
3. Set the shutter to 1/30 second as a minimum speed.
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