William Optics Pleiades 111

Name: William Optics Pleiades 111
Brand: William Optics

William Optics

William Optics Pleiades 111 is a 111 mm Seven-element APO astrograph for wide-to-mid-field nebulae and general deep-sky imaging.

telescope premium

Best Current Offer

Mile High Astronomy

In stock

$14.95

Other retailers

Cloud Break Optics (In stock)
$4,198.00
High Point Scientific (In stock)
$4,198.00

Specifications

Optics

Optical design: Seven-element APO astrograph
Aperture: 111 mm
Focal length: 528 mm
Focal ratio: f/4.8
Dawes limit: 1.05"
Glass / elements: 7-element astrograph with Super ED glass

Imaging

Image circle: 48 mm
Camera format: Full frame / APS-C / Micro 4/3
Full-frame coverage: Yes
Back focus: No flattener required
Corrected field: Native flat field

Specifications

Weight: 17.5 lb (7.94 kg)

Mechanical

Focuser: WIFD rack-and-pinion internal focuser

Astrophotography Fit

Best for wide-to-mid-field nebulae and general deep-sky imaging when the mount, camera format, and correction hardware are chosen as one system.

William Optics Pleiades 111 sits in the telescope slot for wide-to-mid-field nebulae and general deep-sky imaging. The useful headline specs are aperture 111 mm, focal length 528 mm, f/4.8.

Camera coverage: Full frame / APS-C / Micro 4/3. Image circle: 48 mm. Back focus: No flattener required.

Fast astrographs collect signal quickly, but they are unforgiving: collimation, tilt, filter behavior, and back-focus spacing show up immediately in star shapes.

Best paired with

Rigid focuser, tilt adjuster, and exact corrector spacing
Cooled cameras with a sensor inside the corrected image circle
High-throughput filters that behave well at fast focal ratios

Not recommended for

Users who do not want to tune collimation, tilt, and spacing
Thick or narrow filters that show strong bandpass shift at fast focal ratios
Loose camera adapters or focusers that cannot hold the imaging train square

Where To Buy

Some links on this page are affiliate links. Prices and availability are pulled automatically from each retailer and updated daily.

Retailer	Price	Availability	View Offer
Mile High Astronomy Mile High Astronomy	$14.95	In stock Updated 8/4/2026	View Offer - $14.95
Cloud Break Optics Cloud Break Optics	$4,198.00	In stock Updated 8/5/2026	View Offer - $4,198.00
High Point Scientific High Point Scientific	$4,198.00	In stock Updated 8/5/2026	View Offer - $4,198.00

Price History

Chronological retailer pricing with out-of-stock points shown at reduced opacity.

Cloud Break Optics High Point Scientific Mile High Astronomy