This adapter is used to mount a Taurus Tracker III to a telescope
with a 2 inch O.D. threaded rear cell (for example, an 8 inch SCT).
It has an internal pocket designed to accept a removable TAURUS Focal
Reducer Lens RLS (not included). It can also be used with either a
Meade or Celestron f/6.3 focal reducer/field flattener. I recently sold
my Taurus Tracker III to someone using a 10" SCT so I still have this
adapter available. Sales new for $60 but I'll take $40 obo. The ATF2
can been seen in the image below on the right side (other parts not included).