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
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.
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
Sensor tilt adjuster
Yes
Camera angle rotator
Yes
84719
Data sheet
Aperture (mm)
111
Camera adapters
Tilt adjuster; M92 to M78 rotator; M78 to M48 and M54 adapters
Camera format
Full frame and APS-C
External flattener required
No
Focal length (mm)
528
Focal ratio
4.8
Focuser travel (mm)
35
Focuser type
WIFD rack-and-pinion
Image circle (mm)
45
Lens elements
Seven elements including three Super ED elements
Manufacturer image circle (mm)
45
Mounting plate
Losmandy-style
Optical design
7-element astrograph
OTA weight (kg)
7.95
Total weight (kg)
10.31
Tube length (mm)
645–785
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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
