Orion 8881 2-Inch Low-Profile Dual Speed Crayford Telescope Focuser Heavy-duty focuser makes a great upgrade for rack-and-pinion focusers. Anodized-aluminum construction easily supports astrophotography cameras or heavy 2" telescope eyepieces Roller-bearing based Crayford design eliminates image shift and includes 11:1 fine focus control. Low-profile design is great for astrophotographic use Fits Orion 8" and 10" Newtonian and Dobsonian reflector telescopes