Starizona EvoFF - Field Flattener for SkyWatcher EvoGuide 50ED

A 6.4-Degree Flat Field for APS Sensors

Small, fast guidescopes like the SkyWatcher EvoGuide 50ED naturally exhibit field curvature, which renders stars at the edge of the frame as elongated streaks instead of pinpoints. The Starizona EvoFF is engineered specifically to counteract this optical aberration, producing sharp, point-like stars across the entire image. This flattener creates a fully corrected image circle suitable for sensors up to APS size (28mm diagonal), enabling an impressively vast 6.4-degree field of view on the sky. This combination effectively transforms a simple guidescope into a powerful, ultra-portable astrograph ideal for capturing large emission nebulae and sprawling star fields. The EvoFF has also been tested to work with the Askar 52mm Super ED Guidescope, offering similar wide-field imaging capabilities.