Who you jivin' with that Cosmic Debris? "all science is either physics or stamp collecting" -- Lord Rutherford
-- Matt -observing since fall 2012 16" F/4.5 truss DOB / EON 120mm ED / 10" F/5 strut DOB Paracorr (T1 tunable),telrad, RACI finders, AltAz Tripod mount ES 82° 4.7,6.7,8.8,30mm AT Paradigm 60° 25,18,12mm Pentax XW 70° 20,14mm , Baader zoom observing list/notes.. beginning dslr astrophotos (moon/widefields)
Quote: I guess this must be pretty common ?
Quote: If works best with f/5 to f/7? reflector scopes and is designed to fix the off axis coma that's inherent in a parabolic mirror.
Quote:I'm pretty sure the Barlow effectively multiplies the focal length of the scope by spreading out the rays so you only see a reduced angle. Similar to the thing that happens when you buy your first DSLR, and find all of a sudden your 200mm lens is a 300, and your 20mm lens is a 30. Don't know how this affects the focal plane, but I guess it moves it some.