Quillon Halyard 5 mm wide-field eyepiece, with hard case

Specifications

Description

The Halyard 5 mm is a five-element wide-field eyepiece with a 60-degree apparent field and a 1.25 in barrel. At this focal length it works as a high-power eyepiece for close double stars, planetary detail, and the dense cores of globular clusters. In a 1,200 mm telescope it gives 240x with a true field of about 0.24 degrees, and in a 2,032 mm Schmidt-Cassegrain it gives 406x with a true field of about 0.14 degrees. Start at lower power and centre the target before you switch to this eyepiece.

The 5.0 mm field stop sets the true field in every telescope. Because the apparent field is 60 degrees, the eyepiece keeps the image wide at high power, so you can hold a target near the centre of the view for longer. The five elements are fully multi-coated to reduce internal reflections in the high-power beam. Edge sharpness depends on the telescope, and faster reflectors will show more softening toward the edge than slower refractors.

The eye relief of 10 mm is short for an eyepiece of this design. Observers who wear glasses may need to remove them to see the full field, and the rubber eyecup gives limited support against the brow. The barrel is threaded for standard 1.25 in filters. Combined with a Barlow lens, this eyepiece reaches high magnifications, so check image steadiness before using the combination. At 95 g, the eyepiece balances well on a focuser and a diagonal of moderate weight.

About this configuration

The Quillon Halyard 5 mm wide-field eyepiece is offered in several configurations, and the notes below describe what this particular one adds. 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. The fold-down rubber eyecup blocks stray light, and you can fold it back if you observe with glasses.

Silver anodizing has the same wear resistance as the black finish, with a lighter look. This is the 2026 edition, the most recent version of the Halyard line in the catalog. 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 rubber eyecup
• Top and bottom dust caps
• Padded storage pouch
• Hard foam-lined case

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).
• Eye relief of 10 mm suits observers without glasses; glasses wearers may need to remove them.