Optec Sagitta Off-Axis Guider

An off-axis guider eliminates differential flexure, a common issue where the guide scope and main telescope shift slightly relative to each other during long exposures. By using the same optical path as your main camera, the Sagitta ensures your guiding is perfectly aligned with your imaging sensor, leading to tighter, rounder stars.

The Sagitta is highly versatile and compatible with most common telescope designs, including refractors, reflectors, Schmidt-Cassegrains, and Maksutov-Cassegrains. As long as your setup can accommodate the 31.7 mm back focus requirement, it should integrate seamlessly into your imaging train.

Manual operation means you are responsible for adjusting the pick-off prism and focus manually to find a suitable guide star. While it requires a bit more hands-on attention during setup compared to automated systems, it offers a reliable, straightforward experience without the need for complex electronic calibration.

The 31.7 mm back focus is a standard measurement, but you must ensure your total imaging train—including camera, filter wheel, and adapters—falls within your telescope's specific back focus tolerance. It is essential to calculate your total spacing before purchasing to ensure you can reach focus.

Yes, the aluminum build is designed for durability and rigidity, which is critical for maintaining precise alignment. It provides a stable platform that resists the minor vibrations and flex that can ruin long-exposure astrophotography.