Off-axis guiding (OAG) uses a small prism or mirror inside your main telescope’s optical path to pick off light from a guide star. This means the guide camera shares the exact same optical axis as your imaging camera.
Advantages: It eliminates flexure problems caused by separate guide scopes moving independently, leading to more accurate guiding corrections.
Challenges: Finding a suitable guide star can be trickier because the prism slightly reduces the main light path, and setup requires more precision.
OAG is ideal for advanced astrophotographers seeking the highest guiding accuracy and minimal mechanical errors, especially with heavy or complex imaging setups.
