Flattener / Reducer / Correctors

This reducer effectively shortens the exposure time and significantly increases the field of view.

• Designed for the Askar 103APO
• Reduces the focal length by a factor of 0.8
• Screwed to the focuser
• Camera-side threads M68x1, M54x0.75 and M48x0.75
• 55 mm backfocus from M48 thread

This flattener is designed for the Askar 103APO and corrects curvature and coma.

• Designed for the Askar 103APO
• corrects curvature and cona
• Screwed to the focuser
• Camera-side threads M68x1, M54x0.75 and M48x0.75
• 55 mm backfocus from M48 thread

The Svbony SV193 combines two essential functions for ambitious astrophotographers: focal length reduction and field flattening. With a reduction factor of 0.8, it shortens the effective focal length of the SV503 80mm f/7 from 560 mm to approximately 448 mm, enabling a wider field of view and shorter exposure times—ideal for deep-sky imaging.

Technical Features

• Optical design: 3 elements in 3 groups, fully multi-coated for high light transmission and minimized reflections
• Connection: 2″ barrel with M54x0.75 thread for cameras; compatible with full-frame sensors
• Filter thread: Standard 2″ thread for integrating light pollution filters
• Housing: Hard-anodized aluminum, lightweight and durable
• Field flattening: Corrects spherical aberration and edge distortion for sharp star images across the entire field