Components of photometric instrumentation

Some components of the photometric equipment designed and made for the high speed multichannel stellar photometry for the Whole Earth Telescope (WET) program and other astronomical programs are described. Aside from special purpose, this quipment could also be used for any kind of stellar photometry, especially for observations of variable stars. The small size and weight of the equipment make it suitable for observations in expedition conditions. An original solution of the step-motor feeding for the filter wheel rotation is presented, and the FD 306 filter setting system based on it is described and discussed. (Author)