TS-Optics 2.5" rack and pinion focuser with M117x1 connection and 360° rotation

2.5" TS Rack and Pinion Focuser for DIY Scopes and Scope Upgrades

This focuser is superior to conventional Crayford focusers because storage and adjustment are decoupled from each other. This means that sensitive tuning with good storage is possible, even at maximum load.

The rack and pinion gear drive adjustment:

A conventional Crayford focuser works with contact pressure. The weaker the pressure, the softer the extension, although there is always a risk of slipping because adjustment and storage are combined. This excerpt is completely different:

The extension tube is fixed with ball bearings. The bearing is optimized in such a way that maximum rigidity is achieved. Extension tube adjustment is achieved through a helical toothed rack. The advantage is an absolutely jerk-free fit.

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%.

Easy adaptation to your telescope through the connection thread M117x1:

The focuser has an internal thread M117x1 as a connection on the telescope side. Plus, you can rotate the entire focuser 360° so you always have a comfortable focus position. We would also be happy to manufacture individual transition adapters for your telescope. However, keep in mind that the free opening on the extension side of your telescope must be at least 74mm. This is the diameter of the extraction tube with the rack.

We recommend the focuser especially for refractors (Apos, ED...) from 90mm aperture. The wide adjustment range allows for a wide range of accessories. We also offer spacers with internal and external threads M117x1.

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