127mm Achromatic Doublet Refractor Air-Spaced Crown-and-Flint Optics Dual-Speed Focuser for Fine Adjustment Dielectric-Coated Diagonal Included Cradle Ring Assembly with Vixen-Style Dovetail 8x50 Straight-Through Finderscope Description FAQ Specifications In the Box Downloads Warranty Explore Scientific AR127 Doublet Refractor The Explore Scientific AR127 refractor uses a classic 127mm air-spaced, crown-and-flint doublet objective to deliver high-contrast, sharp images of celestial objects at a fraction of the cost of a true apochromatic design. The AR127's 127mm Air-Spaced Doublet Lens This telescope's optical heart is its 127mm (5-inch) achromatic objective lens. The air-spaced doublet design, using traditional crown and flint glasses, provides sharp, detailed views of the Moon, planets, and deep-sky objects. It gathers significantly more light than smaller refractors, resolving details like Jupiter's cloud bands and the Cassini Division in Saturn's rings. As an achromatic refractor, its primary strength is exceptional contrast for its aperture class. However, a degree of chromatic aberration, or false color, is inherent to the design and will be visible as a slight violet halo around the brightest stars and planetary limbs. This is a well-understood trade-off for achieving this level of aperture and portability at this price point. Built for Outreach: Heavy-Duty Focuser and Mounting Designed to withstand the rigors of frequent transport and use at star parties, the AR127 is equipped with robust, professional-grade components. The OTA includes a smooth, dual-speed focuser, allowing for both coarse and fine focus adjustments critical for achieving sharp images at high magnification. A high-reflectivity 2-inch dielectric diagonal is included to ensure maximum light transmission to the eyepiece. The package is completed with a sturdy cradle ring assembly that attaches to a Vixen-style dovetail bar, making it compatible with a wide range of popular German equatorial and alt-azimuth mounts. An 8x50 straight-through finderscope with a quick-release bracket is also included to help you locate and center objects in the main eyepiece. What kind of views can I expect from the AR127 on the Orion Nebula (M42)? With its 127mm aperture, the AR127 will provide bright, detailed views of the Orion Nebula (M42). You can expect to resolve the four main stars of the Trapezium at the nebula's core and see extensive nebulosity stretching across the field of view, especially from a dark-sky site. The fast f/6.5 focal ratio makes it well-suited for framing large deep-sky objects like this. How does the AR127's achromatic design handle bright objects like Jupiter? The AR127 will show significant detail on Jupiter, including its main equatorial belts, zones, and the Great Red Spot. However, because it is an achromatic refractor, you will notice a faint purple or violet halo around the planet's limb. This is known as chromatic aberration and is a normal characteristic of this optical design. Using a light yellow or a specialized fringe-killer filter can help reduce this effect and improve contrast. Is the Explore Scientific AR127 suitable for astrophotography? Yes, the AR127 can be used for astrophotography, particularly for lunar and planetary imaging where its sharpness is an asset. For deep-sky imaging, the inherent chromatic aberration will cause stars to appear bloated with colored halos. This can be managed with specialized filters and processing techniques, but for serious deep-sky work, an apochromatic (APO) refractor is generally recommended. What type of mount is recommended for the AR127 refractor? A sturdy German equatorial mount like the Explore Scientific iEXOS-100, Celestron Advanced VX, or Sky-Watcher EQM-35 is a good match for visual use and light imaging with the AR127. For more serious astrophotography, a mount with a higher payload capacity is recommended to handle the telescope and additional camera gear. What is the benefit of the AR127's dual-speed focuser? The dual-speed focuser provides two focusing knobs. The larger knob allows for rapid, coarse adjustments to quickly find the general focus point. The smaller knob offers a fine-adjustment ratio (typically 10:1), enabling you to make very small, precise changes to achieve critical sharpness, which is especially important for high-magnification planetary viewing and astrophotography. Can I get optical test data for my specific AR127 telescope? Yes. Explore Scientific offers interferometric optical data for your specific telescope upon request. You must own the telescope for at least 120 days before contacting their customer service to request the report for your serial number. GTIN 812257010974 Explore Scientific Warranty
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