William Optics Ultra Flat 156 0.79x reducer (SKU: P-FLAT-156)

William Optics Ultra Flat 156 0.79× reducer (William Optics, SKU: P-FLAT-156) is a focal reducer and field flattener designed for the Fluorostar 156 refractor. It reduces the focal length to 0.79 of its original value and provides a corrected field for full-frame astrophotography.

Key features

• combined focal reduction and field flattening
• three-element design in three groups
• threaded connections to the telescope and camera

Included items

• focal reducer and field flattener: Ultra Flat 156

Technical specifications

• compatible telescope: William Optics Fluorostar 156
• reduction factor: 0.79×
• optical design: 3 elements in 3 groups
• telescope-side thread: M92 × 1
• camera-side thread: M54 × 0.75
• required backfocus: 55 mm
• image circle diameter: 43.2 mm
• optical length: 75.5 mm
• weight: 1202 g

The reducer widens the imaged area of sky and allows the Fluorostar 156 to photograph more extended objects.