Svbony Sv215 Zoom Eyepiece, 1.25 Inch Zoom Lens, 3Mm To 8Mm Eyepiece With Parfocal Design, Telescope Accessory For High Power Lu

The Sv215 Zoom Eyepiece Is Designed To Provide The Good Balance Of Contrast, Comfortable Eye Relief, And Resolution For The Critical Planetary Observer, Particularly Those With Ultra-Premium Short Focal Length Refractors. Parfocal Design: Sv215 Zoom Eyepiece Maintains Focus Throughout The Zoom. You Don'T Have To Refocus When You Magnify. Click /Stops: Improve The Customer'S Hand Feel Of Variable Times Adjustment Operation. Smooth Zoom Action With Click-Stops At 3, 4, 5, 6,7 And 8Mm For Quick Changes To Precise Preset Magnifications. Apparent Field Of View: 56:The Field Of View Will Not Change With The Change Of Focal Length, The Process Of Doubling To Give Customers A Fixed Point To Pull Into The Visual Enjoyment. Eye Relief: 10Mm: The Transformation Ratio Customers Do Not Need To Adjust The Distance Of Eye Relief, So As To Adapt To The Observation Environment Again And Improve The Observation Comfort. Fold-Down Rubber Eye Cup: Be Friendly To People'S Eyes. A Rubber Grip Ring And With Safety Undercut For A Secure Fit In The Eyepiece Holder. Specification: Focal Length 3-8Mm Barrel Size: 1.25'' Apparent Field Of View: 56 Coatings: Fully Multi-Coated Blackened Lens Edges: Yes Eye Relief: 10Mm Parfocal: Yes Filter Threads: M28.5X0.6 Lens Elements: 6 Lens Groups: 4 Barrel Type: With Safety Undercut Rubber Eye Guard: Yes Package Includes: 1X Svbony 3Mm-8Mm 1.25'' Zoom Eyepiece 1X Rubber Dust Cover 1X Mirror Cloth