Refracting Astronomical telescope objective lens double separation multi - layer broadband green film 106F900 D106 F900

Refracting Astronomical telescope objective lens double separation multi - layer broadband green film 106F900 D106 F900
Astronomical telescope objective lens

Diameter: 106MM (106MM is the actual diameter, the effective caliber is 102 MM)

Focal length: 900MM

Double-separation full-surface coating of multi-layer broadband green film.
Note: The lens assembly Note:
The thinner piece of glass (biconvex) has a relatively small (more convex) radius with a thick glass concave surface



Together with the middle separated by a circle, the relative radius of the thin glass surface is the largest point toward the telescope