TS-Optics PHOTOLINE 2.5-inch rack and pinion focuser - self-adaptive

Teleskop Service has been supplying telescopes to amateur astronomers and astrophotographers for years. Our goal is to provide these telescopes with first class focusers at a reasonable price. Our 2.5" RPA focuser is an alternative with a quality that can be found in the high range. Many of our TS-Optics PHOTOLINE apo refractors are equipped with this focuser.

The rack and pinion adjustment:

A Crayford focuser works with contact pressure. Shaft pressure loads the ball bearings and also reduces adjustment sensitivity. The RPA focuser is also mounted on ball bearings, but the adjustment via a rack is decoupled. The advantage is that the bearing can be optimized, resulting in maximum stiffness. Even at maximum load, the adjustment is very responsive and jerk-free.

The support of the extension position is also optimized. No clamping screw simply presses on the extension tube, but the position of the adjustment is fixed. This keeps the focus position at 100%.

2" and 1.25" self-centering adapters

A good friction fit is also necessary when attaching 2" and 1.25" fittings. Simple clamping screws would cause tilting. The PHOTOLINE RPA Focuser mounts centrally, evenly encompassing the entire 1.25" or 2" receptacle.

The adaptation of the focuser to the telescope

The outside diameter of the focuser is reduced to 79mm on the telescope side. Therefore, suitable telescope adapters should have an inner diameter of 79.1mm. Additionally, the connection offers a 5mm slot from the top, which is ideal for clamping. That is why we recommend fixing the connection adapters 5 mm from the stop edge (center of the thread). Fixation with M5 or M6 screws would be ideal.

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