Quillon Halyard 5 mm wide-field eyepiece, with soft pouch

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

All configurations of the Quillon Halyard 5 mm wide-field eyepiece share the same optical design; the options change the eyecup, the case, and the finish. The soft pouch keeps dust off the eyepiece and fits in a jacket pocket during a session. A soft pouch protects the lenses from scratches when you carry the eyepiece between the car and the telescope. A winged eyeguard helps you hold your eye at the right position, which makes the edge of the field easier to see.

The black body with a color ring lets you tell focal lengths apart quickly under a red flashlight. This is the 2024 edition, which revised the undercut on the barrel and the grip rings of the Halyard line. To find the magnification, divide the focal length of your telescope by the eyepiece focal length in the specifications.

What's in the box

• Eyepiece with rubber eyecup
• Top and bottom dust caps
• Padded storage pouch
• Soft padded pouch
• 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).
• Eye relief of 10 mm suits observers without glasses; glasses wearers may need to remove them.