1. Focal length: 7-21mm 2. Zoom type: linear 3. Lens structure: 6pcs / 4 groups 4. Eye protection: 18mm-16.3mm 5. Pupil spacing: 15mm 6. Field of view: 57-40 degrees 7. Coating: fully multi-coated green 8. Tube size: 1.25 inch 9. Thread size: M28.5 x 0.6 10. Overall length: about 93mm 11. Net Weight: about 133g
Features: 1. Fully multi-coated premium eyepieces that can zoom any focal length between 7-21mm 2. Can instantly amplify low power to high power 3. Compatible with any telescope that accepts a 1.25-inch eyepiece 4. 6-element, 4-group premium optical design 5. Comfortable 18mm-16.3mm relief, perfect for eyeglass wearers
