Airy Disk APO 60mm f/5.5 ED Apochromatic Doublet Refractor - 60ED

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Airy Disk Products Brochure Airy Disk makes ED and APO telescopes, lenses, spherical and asphericalmirrors with diameters ranging from 45mm to 400mm. Our production process is high ly integrated. From lens and optical system design, nearly all steps of the telescopemaking process are now in-house: Blank Preparation, Lens Grinding, Polishing and Centering Coating Quality Control Lens mounting Final assembly and inspection, collimation and interferometric testingPackaging The glass used comes from CDGM and Hoya. Lens mounts are made by the in-house CNC department as are most ofthe telescope components. State of the art testing equipment, a huge collection of sphericalmasters, Fizeau interferometer in red(632.8nm), TwymSan green ingreen spectrum(532nm), artificial star and Ronchi. This control over the whole manufacturing process combined with ourskills and experience results in outstanding optics. Decades of specialized ED production using Ohara FPL53. Over theyears, the company has provided optical system design, production,and OEM production for many well-known brands in China. Specifications Glass Used: HOYA, CDGMColor: Black/White (Yellow/Gray Special Order)Tube Material: Aluminum AlloyAperture: 60mmFocal ratio: f/5.5Focal length: 330mmWeight: 1.75kg / 3.85lbsCoating: Full wideband multilayer coatingResolving Power: 1.93"Limiting stellar magnitude: 11.4magDovetail style: VixenFlattener Details: 1x reducer/field-flattener, CAA, M48-T2 connectionFocuser: 2" dual-speed 1:10 rack-and-pinionEyepiece Clamp: 2" with 1.25" AdapterSuitable Photo sensor: APS-CLength (hood extended): 276mmLength (hood in): 237mmWeight: 1.75kg, Package included 2.68kgCarton size: 36cm*30cm*18cm Show more