Photometer

A classical photo multiplier tube (PMT) type single channel photometer can be provided with the following features:

Object Acquisition:
  Object acquisition is provided by the Guide-Acquire-Module (GAM).
Aperture Wheel:
  An aperture wheel is provided with remote control.
Filter Wheel:
  A filter wheel with interchangeable filter positions is provided. The filter wheel is remotely controlled.
Fabry Lens:
  A Fabry lens is provided to image the telescope primary mirror onto the photo cathode of the photo multiplier tube.
Photo Multiplier:
  Various photo multiplier tubes are available. A commercially available PMT housing is used.
Housing:
  The photometer is attached to the Guide-Acquire-Module by its front flange