William Optics Pleiades 111 Astrograph OTA

William Optics Pleiades 111 Astrograph OTA — 111 mm seven-element astrograph

The Pleiades 111 has a 528 mm focal length at f/4.8. William Optics specifies a 45 mm image circle.

Optics and imaging

Its seven-element astrograph design needs no separate field flattener.

Focusing and adapters

WIFD rack-and-pinion focusing provides 35 mm travel. Connections: Tilt adjuster; M92 to M78 rotator; M78 to M48 and M54 adapters. The camera adapter provides backfocus adjustment; set the imaging train according to the manual.

Dimensions and handling

Tube length is 645–785 mm; OTA weight is 7.95 kg. Manufacturer total weight is 10.31 kg.

William Optics manufacturer manual

Imaging optics and mounting

The seven-element optical system includes three Super ED elements and provides field correction within the telescope. Rear tilt adjustment and camera rotation help align and frame the imaging sensor. The manufacturer lists a Losmandy-style mounting plate.

Compatibility notes

Unlike a generic Petzval focus-range assumption, Pleiades spacing must follow the model-specific manual. Do not assume compatibility from sensor diagonal alone.

Additional specifications