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.
Manufacturer model: William Optics Pleiades 111 Astrograph OTA · Specifications checked against manufacturer data on 2026-11-03
The Pleiades 111 has a 528 mm focal length at f/4.8. William Optics specifies a 45 mm image circle.
Its seven-element astrograph design needs no separate field flattener.
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.
Tube length is 645–785 mm; OTA weight is 7.95 kg. Manufacturer total weight is 10.31 kg.
William Optics manufacturer manual
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.
Unlike a generic Petzval focus-range assumption, Pleiades spacing must follow the model-specific manual. Do not assume compatibility from sensor diagonal alone.
| Sensor tilt adjuster | Yes |
|---|---|
| Camera angle rotator | Yes |
Data sheet
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.
Manufacturer model: William Optics Pleiades 111 Astrograph OTA · Specifications checked against manufacturer data on 2026-11-03
