Fine focusing knob - can be attached to the rack and pinion focuser in place of existing
Well known is that Vixen and Takahashi make the most robust, smooth and accurate rack and pinion focusers today. Despite the Crayford hype, a quality R&P design has far heavier load bearing / locking capacity. Vixen's new Dual Speed Focuser add-on can be attached to the rack and pinion focuser in place of its existing knob and enables coarse and fine focus adjustments just like two speed Crayford designs.
This excellent dual speed focuser reduces focus speed to 1/7, perfect for astrophotography and high powered visual observation which require fine focus adjustment. However, this ratio may be changed somewhat according to weight of the accessories attached to the eyepiece holder.
Dual Speed Focuser 1 pc.
Focus Bracket 1 pc.
Allen Wrench 2mm 1 pc.
Allen Wrench 1.5mm 1 pc.
Allen Wrench 1.27mm 1 pc.
Screws (M3 5mm long) 2 pc.
Attachable to the following optical tubes.
A80M, A105M, NA140SSf, ED81S, ED103S, ED115S, AX103S, VC200L, VMC200L, R200SS and A80SS
Not suitable for the following optical tubes.
VMC95L, VMC110L, VMC260L, VMC330L, R150S, ED80Sf, A70Lf, A80Mf and R130Sf
May also work to improve fine focus adjustment to more mass produced R&P focusers on other telescopes