Celestron CPC 800 XLT GPS 1960's Tasco/Montgomery Ward 60mm refractor 1970's homebrew 6" f/8 Newtonian, Coulter mirrors Meade HD-60 4.5mm, 6.5mm, 9mm, 12mm, 18mm, 25mm Jaegers 18?mm Celestron Ultima LX 5mm Agena 32mm, 38mm Meade 4000 56mm
Cliff Mygatt Astronomical League Master Observer
Astronomical League Lunar II & Constellation Hunter programs national coordinator President, Olympic Astronomical Society Bremerton, WA
Orion XT12i Fully flocked with Zambuto Mirror, Protostar quartz secondary and Moonlite CR focuser
Meade 8" LX10 SCT Fully Flocked with Magellan I DSCs
Orion 120mm and William Optics 80mm Refractors Ethos 21mm,17mm,13mm,10mm,8mm,6mm,4.7mm,3.7mm Nagler 31mm and paracorr type 1
Quote:I'm looking at Crayford focusers for my CPC800. Do I really need two speeds, especially if I don't plan on doing any astrophotography? How fine is the focus control you get with a one-speed focuser? I'm specifically looking at the Crawford Machine extra low profile focuser for SCTs.
Thanks, Mitch... "fmhill"
Quote:Quote:I'm looking at Crayford focusers for my CPC800. Do I really need two speeds, especially if I don't plan on doing any astrophotography? How fine is the focus control you get with a one-speed focuser? I'm specifically looking at the Crawford Machine extra low profile focuser for SCTs. I have two telescopes with dual speed crayford type focusers and two scopes with single speed focusers and trust me, if you are going to spend the money and go through the effort to upgrade, definitely upgrade to 2 speed, they are vastly superior to the single speed focuser. You will never regret going to the two speed type whereas if you go with another single speed, you will always wonder what you are missing...
Celestron C8 / Atlas EQ-G / EqMod / SSAG / PHD / BackyardEOS / Canon T1i / ASI120MM / QHY10
Quote:The two reasons for upgrading are: image shift when focusing with the stock focuser, and wanting finer control during focusing. How much finer than the stock focusing would a single-speed Crayford focuser be? I suppose it may vary per manufacturer...