This essential astrophotography accessory allows you to guide your telescope mount using the actual focal length of your primary imaging instrument. By utilizing a small prism to intercept a portion of the light from outside the main camera's field of view, it completely eliminates the tracking errors caused by differential flexure—a common issue when using separate guide scopes on moving-mirror SCT systems.

The guider features a standard rear thread that mounts securely onto the visual back of your SCT, providing a stable, flex-free connection for your imaging train. It routes star tracking data to a secondary 1.25" port optimized for your autoguider camera or a high-power reticle eyepiece, keeping your deep-sky sub-exposures pinpoint sharp.

Key Features:

• Eliminates Differential Flexure: Guides through the primary optical path of the SCT, compensating directly for shifting primary mirrors or tube flexure during long exposures.

• Compact Integrated Prism: Features a multi-coated pick-off prism that captures a guide star from the edge of the optical path without obstructing the primary imaging sensor.

• Standard 1.25-Inch Guider Port: Outfitted with a standard 1.25" holder to securely accept standard autoguiding cameras or tracking eyepieces.

• SCT-Specific Threading: Designed to attach cleanly to standard Schmidt-Cassegrain rear cells for rigid, reliable mechanical alignment.

• All-Metal Construction: Precision-machined aluminum housing finished with an anodized coating to support heavy imaging trains without flexing.