กล้องดูดาวOrion EON 115mm ED Triplet Apochromatic Refractor Telescope

Description

This premium refractor telescope’s generous, 115mm (4.5″) aperture collects ample light from faint deep-sky objects to provide crisp images with excellent color correction by virtue of the element of FK-61 extra-low dispersion (“ED”) optical glass in its air-spaced triplet objective lens. The apochromatic refractor’s medium 805mm focal length gives it a fairly fast, f/7.0 f-ratio which performs exceptionally well for wide-field visual use or deep-sky astrophotography. Multilayer anti-reflection coatings on every air-to-glass lens surface maximizes light transmission; while an extendable dew shield, blackened lens edges, and multiple internal knife-edge baffles eliminate off-axis reflections and glare to ensure excellent contrast.

A massive, 3″ dual-speed (11:1) Crayford focuser provides precise, backlash-free focus control and easily supports heavy astrophotography gear. The rugged focuser’s drawtube sports an engraved millimeter scale and focus-lock thumbscrew to aid in focus point repeatability – a great time-saver. The EON 115mm ED’s focuser can be rotated in two places, allowing camera framing to be set independently from your preferred positioning of the telescope focus knobs. Non-marring brass compression rings in the 2″ focuser drawtube and included step-down 1.25″ adapter keep installed cameras, diagonals and other accessories free of scratches and thumbscrew gouges.

Product support section

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