TS-Optics 3 inch RAP focuser with ball bearings for Newtonian telescopes

TS 3" Newtonian focuser with rack and pinion and ball bearings

The focuser is intended for do-it-yourself construction and for improving Newtonian telescopes. It holds accessories weighing up to 6 kg and, thanks to the combination of roller bearing and rack and pinion drive, allows clean adjustment without tilting, even under maximum load. The base on the adjustment side is flat and equipped with two M4 internal threads, so that a motorized focuser such as the EAF from ZWO can be mounted without an auxiliary adapter.

Connection to the telescope:

The focuser is supplied with a base for 12" Newtonian telescopes with a tube diameter of 356 mm. We manufacture transition adapters from our 3D printing for smaller tubes with 300 mm (10") and 230 as well as 225 mm (8"). We also offer a transition for tubes with a flat contact surface. All adapters are made of black plastic and are inserted between the metal base and the tube. The openings are therefore light-tight. The opening in the tube must have a diameter of 92 mm, otherwise the drawtube will not fit through.

Connection of camera-side accessories:

The focuser is supplied with a 2" and a 1.25" receptacle. Many threads are available for screw adaptations. We also offer transition adapters for the threads on the focuser, for example to M68x1.

360° rotation at the base without tilting:

The focuser is rotatably attached to the base. An ingenious system prevents the focuser from tilting even under load. You only need to loosen one of the two small grub screws on the side of the focuser and you can then carefully rotate the focuser. Once you have reached the desired position, simply tighten the grub screw again.

Safety informations: PDF Download