[D83mm F500mm Single membrane]

1. Diameter D: 3.3 inches (83 mm).
2. Focal length F: 500mm
3. Coating: General Single Film/Multilayer Broadband Film(400-700NM)
4. Combined image quality: 1/2-1/4
5. Diameter Resistance: +0 / -0.12 mm
6. Center thickness tolerance: ±0.2mm
7. Focal length tolerance: ±0.1%
8. Surface accuracy: 60/40
9. Excension: 1
10. Astronomical Telescope Optical System: Refracture
11. Astronomical Telescope Bracket Type: Without Bracket
12. Note: Two refractive dual isolation objective lens groups. Intended lens used for astronomical telescopes, collimator and collimation objective lenses