Pleiades 181 APO F/5.5 WIFD

The William Optics Pleiades 181 is a premium 181mm aperture septuplet APO refractor engineered exclusively for medium format astrophotography. Featuring a seven-element optical design with three Super ED glass lenses and a minimum Strehl ratio of 0.96, this telescope delivers exceptional contrast and corner-to-corner sharpness across a 55mm image circle without requiring external field flatteners. The innovative Internal Focus Design (WIFD) relocates the focusing mechanism to the telescope's center, providing superior weight distribution, eliminating tube tilt, and enabling stable support for heavy medium format imaging payloads—making it ideal for serious astrophotographers capturing deep-sky objects and celestial events.