Dall-Kirkham Reflectors 180mm to 300mm diameter.
Cassegrain-Newton Reflector D=212mm F=2600mm, F/12,4 (Cassegrain) F=820mm, F/3,9 (Newton)
Newtonian Astrograph D=180mm, F=500mm, F/2,8
Corrected Cassegrain Astrograph D=250mm, F=1250mm, F/5
Cassegrain D=400mm, F=5600mm, F/D 14