Due to the design of this focuser, the knobs are at a 90-degree orientation from most, placing the drive shaft perpendicular to the optical tube when using a curved base.

* For all RCF focusers you must specify whether you want a flat or curved base. For curved bases, you need to specify the radius. If you don'''t, you will get the standard size radius.

Place a note in the shopping cart Comments area specifying "Flat Base" or "Curved Base" and the appropriate radius for the curved base. (Diameter = 2 x Radius)