Brightwell Brook 14 mm wide-field eyepiece, with hard case

Specifications

Description

The Brook 14 mm is a five-element wide-field eyepiece with a 60-degree apparent field and a 1.25 in barrel. It sits between low-power and medium-power eyepieces in a typical kit. It suits the observing most telescope owners do often, such as framing star clusters, sweeping across larger nebulae, and viewing the Moon in sections.

A 14 mm eyepiece gives different magnification depending on the telescope. You will see 50x in a 700 mm refractor, 86x in a 1,200 mm Dobsonian, and 145x in a 2,032 mm Schmidt-Cassegrain. In the 1,200 mm telescope, the true field is about 0.7 degrees, which is wide enough to fit the Double Cluster in one view and narrow enough to show the structure of many open clusters clearly.

The five-element design uses a field lens and an eye lens group to keep the image flat across the 60-degree field. Stars stay point-like out to the edge in telescopes slower than about f/6, with some softening at the edge in faster Newtonians. The lenses are fully multi-coated, and the barrel interior is blackened to reduce stray light. With 15 mm of eye relief, you can view the full field while wearing glasses, and the eyecup folds down to help.

The 14.0 mm field stop sets the true field in every telescope. The eyepiece threads for standard 1.25 in filters, so you can add a filter without changing the focuser setup. At 120 g, it is light enough for a binocular viewer or a small finder, and it pairs with a 25 mm eyepiece to cover low through medium magnifications.

About this configuration

All configurations of the Brightwell Brook 14 mm wide-field eyepiece share the same optical design; the options change the eyecup, the case, and the finish. The hard foam-lined case protects the eyepiece from knocks during travel and stacks neatly with other cases. A hard case keeps the eyepiece safe in a busy accessory box at a star party or an outreach event. A winged eyeguard helps you hold your eye at the right position, which makes the edge of the field easier to see.

Titanium gray shows dust and fingerprints less than black, and it keeps a uniform look over time. The 2023 edition uses the same lens design as later years, with small differences in the grip pattern. The true field in your telescope is roughly the apparent field divided by the magnification you reach with this eyepiece.

What's in the box

• Eyepiece with fold-down rubber eyecup
• Top and bottom dust caps
• Foam-lined storage case
• Hard foam-lined case
• Winged rubber eyeguard

Compatibility notes

• Fits any 1.25 in focuser, diagonal, or Barlow lens.
• The barrel accepts standard 1.25 in filters (M28.5 x 0.6 thread).
• Sharp across most of the field at f/6 and slower; softer at the edge in faster Newtonians.