Quillon Linden 7 mm wide-field eyepiece

Specifications

Description

The Linden 7 mm is a six-element wide-field eyepiece with a 70-degree apparent field and a 1.25 in barrel. It sits at the high-power end of the 6-9 mm range, where image sharpness and steadiness matter more than field size. Its 8.5 mm field stop sets a true field narrow enough to keep planets and close double stars in view without drifting out of the eyepiece.

A 7 mm eyepiece gives high magnification in most telescopes: about 100x in a 700 mm refractor, 171x in a 1,200 mm Dobsonian, and 290x in a 2,032 mm Schmidt-Cassegrain. At these powers the exit pupil is small and the image is dimmer, so you will need to sit close to the lens and hold your head steady. Atmospheric seeing usually limits useful magnification to about twice the aperture in millimetres, so this eyepiece is most useful in telescopes of 100 mm aperture or larger on nights of good air. In a 1,200 mm telescope, the 8.5 mm field stop gives a true field of about 0.4 degrees, enough to fill the view with the core of a small globular cluster.

The six-element design uses cemented and air-spaced lens groups, all fully multi-coated, with blackened edges to reduce internal reflections. It holds sharp stars across most of the field in telescopes slower than about f/6. Faster Newtonians may show slight softness toward the edge of the field. The 14 mm of eye relief suits many observers who do not wear glasses; if you wear glasses, fold down the rubber eyecup to reach the full field.

Because the eyepiece is compact, it fits easily into a short focuser and pairs well with a 2x Barlow lens for higher-power work on double stars. Store it in the supplied case with both dust caps fitted to keep the lens surfaces clean between sessions.

About this configuration

The Quillon Linden 7 mm wide-field eyepiece is offered in several configurations, and the notes below describe what this particular one adds. This configuration comes without a case, which suits observers who keep their eyepieces in a shared foam box. No case is included, so the eyepiece ships in a simple box with its two dust caps fitted. The twist-up eyecup sets your eye at the right distance from the lens, with or without glasses.

The black body with a color ring lets you tell focal lengths apart quickly under a red flashlight. The 2026 edition carries the optics over unchanged and updates small parts such as the caps and the markings. 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 fold-down rubber eyecup
• Top and bottom dust caps
• Padded storage 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).
• Sharp across most of the field at f/6 and slower; softer at the edge in faster Newtonians.