Constant Field of View: 56°

The parfocal zoom eyepiece ensures that there is no need to break away form your observing to change the focal length and you don’t have to refocus after changing the focal length, which brings great convenience for visual astronomy. The generous 56° FOV and smooth zoom action with click-stops at 3, 4, 5, 6, 7 and 8mm are for quick changes to precise preset magnifications.

Constant Eye Relief: 10mm

he parfocal eyepiece features a relatively constant 10mm eye relief through the entire zoom range and it is available to get a higher magnification without eye relief sacrificing, comfortable for observing.

FMC Optics & Lens Edges Blackened

Fully multi-coated and the high index 6-elements/ 4 groups optics ensure high light transmission, and the blackened edge of every glass reduces stray light for excellent and high-contrast images.

1.25” Interface & M28.5*0.6 Thread

The eyepiece is threaded for a filter (standard M28*0.6 female thread) and the barrel interface diameter is 1.25” for connecting to a telescope for visual celestial astronomy, like moon, solar and planetary at a broad range of focal lengths.

For observing with glasses or not and the eyecup is detachable ，Smooth zoom action with click-stops at 3, 4, 5, 6,7 and 8mm for quick changes to precise preset magnifications，for a secure fit in the eyepiece holder

The zoom eyepiece is designed to provide the best balance of contrast, comfortable eye relief, and resolution for the critical planetary observer, particularly for ultra-premium refractors with short focal length.