Jims Mobile, Inc. (JMI) - RCF-1 (Reverse Crayford Focuser 2 inch)

factory assembled with motor

The Reverse Crayford Focuser (RCF) is a light-weight, low-profile focuser with a new revolutionary
design - JMI′s low-cost, high-quality answer to plastic focusers. The reverse Crayford
design gives zero image shift and zero backlash. (U.S. Patent No. 6,297,917)

Factory Assembled with Motor

Please Note:  When using a laser collimator, keep in mind that there will be slight deviations in
the laser beam when moving the drawtube through the full length of travel. This deviation is not
noticeable visually, is only a small fraction of the amount present with a normal rack-and-pinion
focuser and is completely eliminated with the higher quality of most of the NGF focusers.

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.