William Optics Dr. Flat Master 0.8x reducer (SKU: P-FLAT-RC)

William Optics Dr. Flat Master 0.8× reducer (William Optics, SKU: P-FLAT-RC) is a focal reducer and field flattener for 12–16" William Optics and GSO Ritchey–Chrétien telescopes. It shortens the focal length and corrects field curvature, enabling imaging with large sensors.

Key features

• design intended for RC telescopes
• focal reduction combined with field flattening
• three-element optical design

Included items

• focal reducer and field flattener: Dr. Flat Master

Technical specifications

• compatibility: 12–16" William Optics and GSO RC telescopes
• reduction factor: 0.8×
• optical design: 3 elements in 2 groups
• telescope-side thread: M92 × 1
• camera-side thread: M48 × 0.75
• required backfocus: 86.15 mm
• image circle diameter: 52 mm
• optical length: 64.5 mm
• weight: 697.4 g

Using the reducer provides a wider frame while retaining field correction designed for RC telescopes.