Electric focuser for all Takahashi refractors. I used it on an FS102. Allows vibration-free focusing. Works great and battery lasts for a very long time. New it sells for $129.95.............. my price is $75 including shipping in the lower 48 states. (Payment accepted by cashier's check, certified check, or money order only.)
JMI's definition: "MOTOFOCUS is an electric focus motor for precise, vibration-free focusing without the need to touch the telescope. It is great for visual and photographic use and features variable speed for coarse and fine adjustment. Precise positioning is accomplished through electronic braking. Mounting is easy with no drilling or tapping."