The apparent field of view and the usable eye relief to stay the same as the focal length changes.
Smooth zoom action with click-stops at 3, 4, 5, 6,7 and 8mm for quick changes to precise preset magnifications.
Parfocal across the entire zoom range (minor tweaking may be necessary, however).
|Apparent Field of View||56°|
|Blackened Lens Edges||Yes|
|Barrel Type||With safety undercut|
|Rubber Eye Guard||Yes|
The zoom eyepiece is designed to provide the best balance of contrast, comfortable eye relief, and resolution for the critical planetary observer, particularly those with ultra-premium short focal length refractors.
6-Element/4-Groups, Fully Multi-Coated optics for remarkable sharpness, contrast and color correction.
Fold-down rubber eyeguard and a rubber grip ring.
SVBONY 3mm-8mm 1.25" Zoom Eyepiece
Rubber Dust Cover