Pleiades 181: Seven-element astrophotograph for full frame
The William Optics Pleiades 181 is a pure astrograph, built around a seven-element optical design with FPL-53 glass and integrated corrector. Stars remain sharp points even in the corners of a full-frame sensor, without a separate flattener. The absolute top model: 181 mm aperture in a corrected seven-element system, for observatory-class results.
Fast system, short exposures
With a 181 mm aperture and a 998 mm focal length (f/5.5), this is a fast photographic system: lots of signal in a short time, allowing for deeper exposures per night. The included camera adapters directly connect common phototrains, and the Bahtinov mask allows for precise focusing. This is a camera instrument: visual use with eyepieces is not what this tube is designed for.
In the box
- Optical tube Pleiades 181/998 with seven-element optics
- 3.7 inch rack-and-pinion focuser
- Integrated corrector
- M48-, M54-, and M68-camera adapters
- Losmandy dovetail
- Handle
- Bahtinov mask
- Transport bag
Featured accessories
A William Optics UniGuide Guiding Scope completes the setup for long exposures; choose the size that fits your mount and camera.
For whom yes, for whom no
For the demanding astrophotographer with an observatory or heavy-duty permanent setup seeking refractor-class perfection. Not for almost anyone else; this is a small observatory-class instrument with corresponding mount requirements.
Specifications
| Optical design | Apochromatic astrograph, 7 elements with FPL-53 |
| Opening | 181 mm |
| Focal length | 998 mm |
| Opening ratio | f/5,5 |
| Field of view | Flat and corrected to full-frame |
| Use | Astrophotography (camera-instrument) |
| Execution | OTA (loose tube) |
Unsure about the right tube for your camera and mount? The telescope selection aid helps you choose. Also view all Refracting telescopes and the full range of William Optics.
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