Airy Disk APOs

Airy Disks Triplet Air-Spaced APOs use Hoya FCD-100 ED Glass, a great choice for stargazing and astrophotography.

85mm f/6 (APS-C)
96mm f/6 (APS-C)
106mm f/6.6 (Full Frame)
140mm f/6.5 (Full Frame)
204mm f/7 Triplet ED FK61 Glass (Full Frame)

Airy Disk Doublet Air-Spaced APOs

60mm f/5.5 ED Apochromatic Refractor
96mm f/6 ED Apochromatic Refractor
152mm f/5 ED FCD1 Apochromatic Refractor

A matched flattener M63(0.75x 0.92x or 0.8x) with adjustable backfocus of 55mm-68/88mm(depending on model) is available for all scopes.