Ultra Flat 156 (0.79x Reducer)

Description

The William Optics Ultra Flat 156 is a 0.79x focal reducer and field flattener designed for the Ultra-Cat 131 and other compatible William Optics telescopes with 156mm back focus requirements. It reduces the focal length by 21%, delivering a faster focal ratio and wider field of view while maintaining a flat, corrected field across full-frame sensors. Essential for astrophotographers seeking sharp corner-to-corner star images and shorter exposure times.