The STX Guider attaches to the front of a FW7-STX filter wheel, turning it into a self-guiding filter wheel. The STX Guider is also directly compatible with the AO-X adaptive optics unit, which mounts to the front of the guider.
Self-guiding provides the most reliable and accurate tracking method, since it is not affected by differential flexure problems commonly seen when using separate guide telescopes, particularly with commercial SCTs.
The STX Guider incorporates a KAI-0340 CCD with 640 x 480 pixels @ 7.4u, which attaches to the front of the STX filter wheel so that the guider picks off light from the guide stars before passing through the filters. This ensures a bright guide star image even when narrowband filters are used.
The STX Guider also incorporates optics that act as a 0.7X focal reducer. This doubles the field of view of the guide sensor, resulting in a correspondingly greater selection of guide stars.
There are two smaller adjustment knobs on the STX Guider: one for focus and one for moving the pick-off mirror to avoid vignetting. A third knob on the side of the unit locks the adjustments in place once the best focus is achieved. A short cable is provided to connect the STX Guider to the remote guide head port on the camera. The STX Guider is also fully compatible with the AO-X adaptive optics accessory.
The STX Guider consumes only 1.1″ of back focus, and no additional adapters are required. Weighs only 1 lb. Also works with the FW5-STX.