William Optics Pleiades 181 Astrograph OTA | PixelSkiesAstro
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  • William Optics Pleiades 181 Astrograph OTA | PixelSkiesAstro
  • William Optics Pleiades 181 Astrograph OTA | PixelSkiesAstro
  • William Optics Pleiades 181 Astrograph OTA | PixelSkiesAstro
  • William Optics Pleiades 181 Astrograph OTA | PixelSkiesAstro
  • William Optics Pleiades 181 Astrograph OTA | PixelSkiesAstro
  • William Optics Pleiades 181 Astrograph OTA | PixelSkiesAstro
  • William Optics Pleiades 181 Astrograph OTA | PixelSkiesAstro

William Optics Pleiades 181 Astrograph OTA

€20,990.00
Tax included

William Optics Pleiades 181 Astrograph OTA — 181 mm seven-element astrograph The Pleiades 181 has a 998 mm focal length at f/5.5. William Optics specifies a 55 mm image circle.

Manufacturer model: William Optics Pleiades 181 Astrograph OTA · Specifications checked against manufacturer data on 2026-11-03

William Optics Pleiades 181 Astrograph OTA — 181 mm seven-element astrograph

The Pleiades 181 has a 998 mm focal length at f/5.5. William Optics specifies a 55 mm image circle.

Optics and imaging

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

Focusing and adapters

Rack-and-pinion focusing provides 43 mm travel. Connections: Tilt adjuster; rotator; M48, M54 and M68 camera adapters. The camera adapter provides backfocus adjustment; set the imaging train according to the manual.

Dimensions and handling

Tube length is 1231–1496 mm; OTA weight is 15 kg. Manufacturer total weight is 18.7 kg.

William Optics manufacturer manual

Imaging application

William Optics specifies astrophotography use only; this optical design does not support visual observing. The support parts list specifies a 400 mm Losmandy-style dovetail plate.

Focuser specification

The current manufacturer technical table specifies a 4.1-inch rack-and-pinion focuser with 43 mm travel.

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 adjusterYes
Camera angle rotatorYes
84720

Data sheet

Aperture (mm)
181
Application
Astrophotography only; optical design does not support visual observing.
Camera adapters
Tilt adjuster; rotator; M48, M54 and M68 camera adapters
Camera format
Medium format, full frame, APS-C and Micro Four Thirds
External flattener required
No
Focal length (mm)
998
Focal ratio
5.5
Focuser travel (mm)
43
Focuser type
4.1-inch rack-and-pinion (manufacturer specification table)
Image circle (mm)
55
Lens elements
Seven elements including three Super ED elements
Manufacturer image circle (mm)
55
Mounting plate
400 mm Losmandy-style
Optical design
7-element astrograph
OTA weight (kg)
15
Total weight (kg)
18.7
Tube length (mm)
1231–1496
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