{"product_id":"explore-scientific-es-ed-0806-ff","title":"Explore Scientific ED80 Essential Series Air-Spaced Triplet Refractor Telescope + Field Flattener f\/5 to f\/7 (Bundle)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e80mm Aperture\u003c\/li\u003e\n\u003cli\u003eAir-Spaced Apochromatic Triplet Optics\u003c\/li\u003e\n\u003cli\u003eFeatures HOYA FCD1 Extra-Low Dispersion Glass\u003c\/li\u003e\n\u003cli\u003eIncludes Field Flattener for f\/5 to f\/7 Telescopes\u003c\/li\u003e\n\u003cli\u003eRequires 55mm (+\/- 2mm) Camera Sensor Spacing\u003c\/li\u003e\n\u003cli\u003e2-inch Rack-and-Pinion Focuser\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eED80 Essential Series Air-Spaced Triplet Refractor Telescope + Field Flattener f\/5 to f\/7 (Bundle)\u003c\/h2\u003e\n\u003cp\u003eThis Explore Scientific ED80 Essential Series bundle pairs a true apochromatic 80mm triplet refractor with a matched field flattener designed for systems from f\/5 to f\/7. The included flattener ensures round stars across your camera sensor by correcting field curvature, requiring a precise 55mm spacing for optimal results. Its diffraction-limited optics, featuring HOYA FCD1 glass, deliver high-contrast images through its 2-inch rack-and-pinion focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eApochromatic 80mm Triplet Optics with HOYA FCD1 Glass\u003c\/h3\u003e\n\u003cp\u003eThe heart of the ED80 is its air-spaced triplet lens assembly, which provides true apochromatic correction. By using premium HOYA FCD1 extra-low dispersion glass, the optical design virtually eliminates chromatic aberration, preventing the distracting purple fringing seen on bright objects in lesser scopes. The result is a sharp, high-contrast view with neutral color, whether you're observing the bands of Jupiter or resolving tight double stars.\u003c\/p\u003e\n\u003cp\u003eAll optical surfaces feature Explore Scientific's proprietary EMD multi-layer coatings to maximize light transmission. This ensures the brightest possible images, allowing you to pull faint details out of deep-sky objects like the Orion Nebula (M42) or the Andromeda Galaxy (M31).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging-Ready: Bundled Field Flattener for f\/5 to f\/7 Systems\u003c\/h3\u003e\n\u003cp\u003eThis bundle is specifically designed for astrophotography. Refractors naturally exhibit field curvature, which can cause stars at the edge of an image to appear elongated or comatic, especially with larger camera sensors. This dedicated field flattener is designed to work with telescopes in the f\/5 to f\/7 focal ratio range, correcting this distortion to deliver sharp, point-like stars across the entire frame.\u003c\/p\u003e\n\u003cp\u003eTo achieve a perfectly flat field, the flattener requires a precise back focus distance of 55mm (+\/-2mm) from the flattener's shoulder to your camera's sensor. Note that this component is for photographic use only and is not intended for visual observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePortable Design with a 2-inch Rack-and-Pinion Focuser\u003c\/h3\u003e\n\u003cp\u003eThe ED80 Essential Series is built as a compact, lightweight \"grab-and-go\" instrument. It's easy to transport to a dark sky site and sets up in minutes on a light-to-medium duty mount, making it an ideal choice for spontaneous observing sessions or as a wide-field imaging scope to complement a larger instrument.\u003c\/p\u003e\n\u003cp\u003eFocusing is controlled by a 2-inch rack-and-pinion focuser, providing a stable and reliable mechanism for achieving sharp focus with both eyepieces and heavy imaging trains. The telescope also includes a pre-installed Hybrid Finder Scope Base, ready for your preferred pointing device.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"Apochromatic Triplet\" mean for the ED80's views?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn \u003cstrong\u003eApochromatic (APO) Triplet\u003c\/strong\u003e uses a three-lens objective to bring the red, green, and blue wavelengths of light to the same focal point. The ED80 uses an air-spaced design with \u003cstrong\u003eHOYA FCD1 glass\u003c\/strong\u003e to achieve this. The practical benefit is the near-total elimination of chromatic aberration, or false color, resulting in exceptionally sharp, high-contrast images with pure color rendition, especially on bright targets like the Moon, planets, and bright stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the Field Flattener necessary for the ED80 Essential telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe field flattener is essential for astrophotography with a fast refractor like the ED80. It corrects for the natural curvature of the focal plane, which would otherwise cause stars at the edges of your photos to appear stretched or comatic. This bundle includes a flattener specifically matched for telescopes with focal ratios between \u003cstrong\u003ef\/5 and f\/7\u003c\/strong\u003e, ensuring your deep-sky images have sharp, pinpoint stars from corner to corner.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I achieve the required 55mm spacing for the ED80 and its field flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e55mm back focus\u003c\/strong\u003e is a standard distance in astrophotography. It is measured from the rear flange of the field flattener to your camera's sensor. Most dedicated astronomy cameras and DSLR\/mirrorless cameras with a standard T-ring adapter are designed to meet this 55mm spacing requirement automatically. You may need additional M48 extension rings if your imaging train has other components like an off-axis guider or filter drawer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ED80 Essential telescope for visual observing without the flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The ED80 is an excellent visual instrument on its own. Simply remove the field flattener and insert a 2-inch or 1.25-inch diagonal and eyepiece into the focuser. Field curvature is generally not noticeable during visual observation, so the flattener is not needed or recommended for visual use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the ED80 and flattener perform on a wide-field target like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis setup is ideal for large targets like the Andromeda Galaxy (M31). The ED80's short focal length provides a wide field of view, allowing you to capture the entire galaxy and its satellite companions in a single frame with most astronomy cameras. The field flattener ensures that the thousands of stars across the field remain sharp, preserving the stunning detail of M31's dust lanes and bright core.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ED80 a good choice for imaging planets like Saturn with a high-frame-rate camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the ED80 can show you Saturn's rings visually, it is primarily a wide-field instrument. For serious planetary imaging, a telescope with a much longer focal length (like an SCT or Maksutov) is preferred to achieve the necessary image scale. You can use a Barlow lens with the ED80 to increase its magnification for planetary work, but it is optimized for capturing large deep-sky objects, not fine planetary detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":52909164560669,"sku":"ES-ED-0806-FF","price":799.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-ED80-Essential-Series-Air-Spaced-Triplet-Refractor-Telescope-Field-Flattener-f-5-to-f-7-Bundle-1_d41eed0b-1559-438d-892d-521000355774.jpg?v=1789060550","url":"https:\/\/davidastro.com\/fr-us\/products\/explore-scientific-es-ed-0806-ff","provider":"David Astro","version":"1.0","type":"link"}