TS-Optics 2.5" Rack and Pinion Focuser with M117x1 Connection and 360° Rotation

TS 2.5" Rack and Pinion Focuser for ATM and Telescope Upgrade

This focuser is superior to conventional Crayford focusers because bearing and adjustment are decoupled from each other. This allows a sensitive adjustment even with maximum load.

The rack and pinion gear drive:

A conventional Crayford focuser works with contact pressure. The weaker the pressure, the smoother the focuser, but there is always the risk of slipping, because adjustment and bearing are combined. This focuser is completely different:

The draw tube is fixed in place by ball bearings. The bearings are optimized to provide maximum stiffness. The adjustment of the extension tube is achieved by a helical toothed rack. The advantage is an absolutely jerk-free adjustment.

The clamping of the focuser position is also optimized. No clamping screw simply presses on the draw tube, but the position of the adjustment is fixed. Thus, the focus position is held 100%.

Easy adaptation to your telescope via the M117x1 connection thread:

The focuser has an M117x1 internal thread as connection on the telescope side. In addition, you can rotate the complete focuser by 360° to always have a comfortable focusing position. We will also be pleased to manufacture individual transition adapters for your telescope. Please note, however, that the clear aperture on the focuser side of your telescope must be at least 74 mm. This is the diameter of the draw tube with the gear rack.

We recommend the focuser especially for refractors (apos, ED, ...) with an aperture of 90 mm or more. The large travel allows extensive accessories. We also offer spacers with M117x1 internal and external thread.