Three Fathoms Observatory
Stewart Yeung

 Current Special Feature



Placement of Lepus Reducer in the Image Train (2)

The reducer is designed for a backfocus of about 105mm.

A QHY 2" colorfilter wheel has been added before the Lepus reducer to replace the old SBIG colorwheel that was designed to be attached to the CCD, adding to the backfocus after the Lepus.

The total backfocus for the Lepus has since been reduced to about 100mm, some 5mm short of the ideal 105mm, but still within the tolerance limit of the reducer.