SVBONY TWM1 SV215 Zoom Eyepiece, 1.25 Inch Zoom Lens, 3mm to 8mm Eyepiece with Parfocal Design, Telescope Accessory for High Power Lunar and Planetary Observing

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

• SV215 zoom eyepiece is a good assistant for you to observe and take pictures of the planets; it is a good helper for the amateur astronomers to observe Venus; Mars; Jupiter; Saturn and so on
• Adjustable focal length; SV215 3 mm to 8mm zoom eyepiece equivalent to multiple eyepieces; SV215 eyepiece is much better than the kit eyepieces; this helps you to zoom in and out rather than changing lens
• Parfocal across the entire zoom range; minor tweaking may be necessary; you do not need to refocus every time you change the focal length
• Constant field of view and eye relief; the apparent field of view and the usable eye relief to stay the same as the focal length changes
• Click and stops design; there are clicks and stops as you pass through the marked zoom levels; easy to use even in the dark