William Optics Ultra-Cat 131 WFID APO Petzval OTA | L-UC131 NEAF2026 the peripheral light reduction control

the peripheral light reduction control is excellent

Celestron Starry Night Special Edition Software

Major differences between species groups are explained

T-Threads accept camera brand specific T-Ring (sold separately)

but the story does not end there

William Optics Ultra-Cat 131 WFID APO Petzval OTA | L-UC131 NEAF2026 the peripheral light reduction controlThe William Optics Ultra Cat 131 is the flagship of the Ultra Cat series, representing the pinnacle of wide field astrophotography performance. Built around a large aperture 131mm apochromatic optical system and an advanced 5 element Petzval design, it delivers extraordinary light gathering power, exceptional color correction, and razor sharp stars across an expansive, flat image circle. Designed for serious astrophotographers and observatories alike,