Tecnosky 2" precision rack-and-pinion focuser, suitable for heavy loads without flexing. 60mm excursion version

It is a focuser made entirely with CNC machines and movements on sealed ball bearings: unlike other focusers that have only 4 bearings supporting the load, ours has the drawtube encased in no less than 8 bearings that move inside a grooved guide.
In this way, even when fully extended, it does not have the slightest play or flex, a fundamental feature for modern deepsky photography!

The movement is given by a bronze rack with fine, transverse teeth, the pinion is supported by two high load bearings and finely adjusted on the rack.
Two large knurled knobs operate the focuser movement and a third smaller one the 1:10 micrometric movement. The bronze knob below the focuser increases the pressure between the pinion and rack while the other on the side serves to lock the focuser axis.