The Hedrick 3.5" Motorized Focuser designed by PlaneWave is a heavy duty no-slip focuser capable of handling an imaging payload of up to 20lbs. The focus tube runs on 5 bearings and is driven by a leadscrew so there is no chance of slipping.
Focus may be automated through a computer using PlaneWave’s EFA Kit add-on. The focuser comes with pre-installed motor that can be controlled with the EFA hand control or PWI PC software. The draw tube travel is 1.3 inch.