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Orion Telescopes
Orion EON 70mm ED Quadruplet Astrograph Refractor Telescope
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3 easy payments of $466.66
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  • An exceptional quality wide field ED astrograph for taking breathtaking photographs of the night sky
  • 350mm f/5 lens system with an image circle of 43mm provides almost 6-deg of sky with a full format camera!
  • A four-element lens system utilizing two Hoya FC-100 ED lenses for the ultimate in color correction, detail and contrast
  • Flat field image for cameras up to 35mm full format - no need for a separate field flattener!
  • Weighs just 8.5 lbs with rings and dovetail bars attached

Learn more
Item #  10383b

Wide field photographs of the night sky can be stunning, especially large swaths of the Milky Way which are rich in colorful nebulae and star clusters. We can think of no better way of capturing these beautiful and expansive vistas than with the EON 70mm ED Quadruplet Astrograph Refractor Telescope. With a focal length of 350mm at f/5, thousands of stars will appear in your frame in just a matter of a few minutes exposure. And with Hoya FCD-100 ED glass, your photographs will look stunning - with high contrast, excellent color correction, and a beautifully flat field of view.

Let's start with the lenses themselves. The 70mm EON Quad features a four element optical system, to produce a stunningly flat field of view without the need of extra field flattener lenses. Let's face it - a field flattener can be a pain to install, because you have to make sure to get the correct sensor-to-flattener distance, without being more than a few millimeters off. With the 70mm Quadruplet astrograph, that doesn't matter! Simply attach your camera and find focus - the edges are flat and corrected already! Two lenses are made from Hoya FCD-100 ED (extra-low dispersion) glass for incredible color correction and sharpness. And with an image circle of 43mm, even when attaching a full format camera, there will be minimum vignetting at the edges of the field of view. With the Orion StarShoot G26 APS-C cameras, the field of view is 3.8x 2.6, and with the G24 Full Format, the field is an astounding 5.9 x 3.9!

Image of The Heart Nebula

The Heart Nebula, taken with the 70mm Quad Astrograph Refractor and the Orion G26 Mono Imaging Camera through narrowband filters.

The 3" rack-and-pinion focuser is extremely robust, with a 10:1 reduction gear and a large bias cut rack to minimize any backlash. Your camera will thread directly onto the focuser instead of using a 2" nosepiece. This fully locks the camera in position for stability as well as flex-free operation. The 360 rotatable focuser collar will allow for precise composition of your photograph before locking down solidly. To attach your camera, two step-down threaded adapter rings come standard with the 70mm EON, with interfaces including male 42mm t-thread, male 48mm t-thread, and the native female 54mm thread of the focuser itself. The 54mm-48mm adapter also includes a forward facing internal 48mm x 0.75mm thread pocket to attach some 3rd party filters that can utilize that specific thread. The focus point is located 69.5mm behind the 48mm adapter, leaving plenty of room for DSLR cameras, or even monochrome cameras coupled to filter wheels and off-axis guiders. Note that different camera models have widely varying back-focus requirements. The focuser drawtube has a 29.5mm focus travel range, so be sure to measure where your camera will focus, and add optional extension t-thread spacers if necessary to reach that focus with your particular camera. Please also note that this is an astrograph only with adapters design to attach cameras, but not eyepieces.

The dew shield on the EON 70mm Quadruplet Astrograph Refractor slides in and out, making the entire telescope only 12.75" long when fully retracted. When extended, small setscrews in the dew shield bevel can be tightened down to hold the dew shield firmly in place - ideal if using a flat panel for flat field calibration frames when you want to rest the weight of the panel on to end of the dew shield without it sliding down. Dual machined rings hold the refractor solidly in place, and include multiple threaded holes on the side walls for extra accessory mounting possibilities. The bottom Vixen-style dovetail bar attaches to any Vixen compatible telescope mount, and the top rail also includes threaded holes for more accessories and even has an Arca-Swiss dovetail cut into the edges of the dovetail bar. The possibilities for mounting accessories are almost endless!

Includes a hard case to fully protect your refractor, a slip-on metal dew shield dust cover, and a thread-on rear port cap. A standard Orion finder dovetail shoe is bolted to the side, making it ideal for attaching a guidescope. In fact, with the short 350mm focal length of this telescope, the Ultra-Mini 30mm guidescope is perhaps the ideal way to autoguide your astrograph. This setup will be lightweight, compact, and rock solid when bolted to your EQ mount. The entire telescope with rings and dovetail bars attached weighs only 8.5 lbs!

If you wish to enhance your astrophotography arsenal with some of the best wide field optics available, the Orion EON 70mm ED Quadruplet Astrograph Refractor is the perfect small telescope for the job. Pair this beautiful flat-field refractor with a DSLR or cooled CMOS camera and begin taking "wall-worthy" photographs of the night skies.


Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at 800-447-1001.

Product Support
Visit our product support section for instruction manuals and more
  • Best for imaging
    Deep sky
  • User level
  • Optical design
  • Optical diameter
  • Focal length
  • Focal ratio
  • Coatings
    Fully multi-coated
  • Optics type
    4-element optical system
  • Glass material
    Extra low dispersion FCD-100
  • Resolving power
  • Optical quality
    Diffraction limited
  • Finder scope
  • Focuser
    3" dual-speed Rack-and-pinion
  • Mount type
    Optical Tube without Mount
  • Backfocus distance
  • Tube material
  • Length of optical tube
    12.8 in.
  • Weight, optical tube
    6.6 lbs.
  • Additional included accessories
    54mm - 48mm step down ring (0.75mm thread pitch), 48mm to 42mm step down ring (0.75mm thread pitch)
  • Other features
    Flat field images up to full format sized sensors, 43mm image circle, Includes Hoya FCD-100 ED glass
  • Warranty
    One year

Orion 70mm f/5 ED Quadruplet Astrograph Refractor
Hinged tube rings
Vixen style Dovetail bar (bottom)
Vixen/Arca-Swiss style Accessory Dovetail bar (top)
54mm male - 48mm male T-thread step-down ring
48mm female - 42mm male T-thread step-down ring
Lens caps

Orders received by 1pm Eastern Standard Time for in-stock items ship the same business day. Order received after noon will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.

A per-item shipping charge (in addition to the standard shipping and handling charge) applies to this product due to its size and weight. This charge varies based on the shipping method.

Standard Delivery: $0.00
Standard Delivery to Canada: $25.00
3 Day Delivery: $50.00
2 Day Delivery: $50.00
Next Day Delivery: $50.00

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