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ASKAR FMA180 objective lens features Triplet air-spaced APO design, includes two pieces of ED (extra-low dispersion) glass, providing excellent correction of chromatic aberration, which lays the foundation for high quality astrophotography and observation.

Specifications

Aperture: 40mm
Focal Length: 220mm (objective lens), 180mm (with the reducer)
Focal ratio: f/5.5 (objective lens), f/4.5 (with the reducer)
Objective Type: Triplet dual ED air spaced APO (objective lens)
Sextuplet refractor for full-frame astrophotography (with reducer)
Overall Length: 145mm (Photographic mode with focal reducer)
Body Weight: 22
Back end adapter: M42x0.75 (photographic mode), 1.25" adapter (observation mode)
Body Weight: 395g
IncludedL FMA180 body, a pair of tube rings, a finder scope bracket, two extension tubes, 1.25" adapter, an Allen wrench, a manual.