Explore Scientific BT 150mm ED Giant Binocular
type: Product
description: Two 150mm objectives, each a 2-element FK-61 ED doublet working at 840mm f/5.6, put the BT 150mm ED among the few genuine six-inch binocular telescopes in production. The APM 150mm 45-degree ED-APO is built on the same FK-61 glass and a similar magnesium body; Explore Scientific purges this one with argon instead of nitrogen and backs it with free adjustment, cleaning and collimation service for as long as you own the instrument. This is the largest aperture Explore Scientific builds for two-eyed observing, and at 41 pounds bare it is an installation rather than a grab-and-go. Key Features Dual 150mm FK-61 ED doublets. FK-61 sits in the fluorine crown family and delivers chromatic correction comparable to Ohara FPL-51, which is what keeps the lunar limb and bright stars free of the violet fringing that a six-inch achromat at this focal ratio would show. 840mm focal length at f/5.6. With the supplied 62-degree 20mm eyepieces that works out to 42x over a 1.5-degree true field, wide enough to frame the Double Cluster whole while still resolving it. Rated to 100x by Explore Scientific. The 1.25-inch eyepiece holders take any standard eyepiece, so an 8mm pair puts you at 105x for lunar and planetary work, at the top of the range Explore Scientific guarantees for image quality. EMD coatings on every optical surface. Enhanced Multi-Layer Deposition across all air-to-glass surfaces, the same coating family used on the rest of the BT line. Argon-purged magnesium alloy chassis. Argon molecules are larger than nitrogen and leak past seals more slowly, which is the practical argument for it on an instrument that will spend years going from a warm house into cold night air. Individual eyepiece focus. Each side focuses independently, so you set your own diopter once and leave it. There is no center focus wheel to drift. Extendable dew shields and an integrated hand grip with sighting shoe. The shields pull out over the objectives against dew and stray light, and the handle carrie…
brand: Explore Scientific
sku: 01-14260
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offers: AggregateOffer
  low price: 9999.99
  high price: 9999.99
  price currency: USD
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    price: 9999.99
    price currency: USD
    availability: https://schema.org/OutOfStock
    item condition: https://schema.org/NewCondition
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    sku: 01-14260

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