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 €
Tasse incluse

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

Scheda tecnica

Apertura (mm)
181
Applicazione
Astrophotography only; optical design does not support visual observing.
Adattatori per camera
Tilt adjuster; rotator; M48, M54 and M68 camera adapters
Formato camera
Medium format, full frame, APS-C and Micro Four Thirds
Richiede spianatore esterno
No
Focale (mm)
998
Rapporto focale
5.5
Corsa del focheggiatore (mm)
43
Tipo di focheggiatore
4.1-inch rack-and-pinion (manufacturer specification table)
Cerchio d'immagine (mm)
55
Elementi ottici
Seven elements including three Super ED elements
Cerchio d'immagine dichiarato (mm)
55
Piastra di montaggio
400 mm Losmandy-style
Schema ottico
7-element astrograph
Peso del tubo ottico (kg)
15
Peso totale (kg)
18.7
Lunghezza del tubo (mm)
1231–1496
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