If you're looking for a large-aperture reflector that can handle serious astrophotography while still delivering stunning visual views, the iOptron 10" f/4 Imaging Newtonian Reflector (#6313) deserves a place on your shortlist. With a generous 254mm (10") aperture and a fast f/4 focal ratio, this scope is built to gather light quickly, cover wide swaths of sky, and reveal faint deep-sky targets with sharp contrast and clarity. And thanks to its dual-speed 2" Crayford-style focuser, it's equally capable of high-quality visual observing with your favorite 1.25" or 2" eyepieces.
Designed with astrophotographers in mind, this Newtonian comes pre-drilled for iOptron’s iEAF electronic automatic focuser (sold separately), giving you an easy upgrade path to motorized focusing and software-controlled automation. But even without the iEAF, its mechanical construction is solid and thoughtfully executed, with features you'd expect to find in scopes costing far more.
Fast, Bright, and Wide-Field Capable
The 10" aperture gathers over 1200 times more light than the unaided eye, making it ideal for pulling in galaxies, emission nebulae, planetary nebulae, globular clusters, and even fainter reflection and dark nebulae under darker skies. The f/4 focal ratio makes it an astrograph by design—producing a flat, wide field that’s well-suited for APS-C and full-frame sensors when paired with a coma corrector (sold separately).
For imaging, this means faster exposures, less demand on guiding accuracy, and an ideal balance between resolution and field of view. For visual use, it means bright, bold views—particularly on extended objects like the Veil Nebula, Andromeda Galaxy, or Orion Nebula, where a wide true field and fast optics make a real difference.
Precision Focuser – iEAF Ready
The dual-speed 2" Crayford-style focuser provides smooth, backlash-free focusing that holds heavy loads with ease. Fine focus control is essential at f/4, and the 10:1 microfocusing knob lets you make razor-sharp adjustments—whether by hand or with an iOptron iEAF motor, which can be added using the pre-drilled mounting holes. A 2" to 1.25" adapter with brass compression ring is included, allowing you to use any standard eyepiece or imaging accessory.
Sturdy Rings, Finder, and Mounting Rail
The optical tube is supported by a pair of CNC-machined tube rings, each with top mounting points for adding guidescopes or accessories. A Vixen-style dovetail rail is attached to the bottom of the rings, making it easy to mount to a wide variety of equatorial systems, including the iOptron GEM45, CEM40, HEM44, and others in the ~30–45 lb payload class.
The included 8x50 straight-through optical finder gives a bright, wide field that makes alignment and object acquisition easy, whether you're imaging or observing visually.
Fully Collimatable, Fully Capable
As with all fast Newtonians, collimation is key to performance—and this OTA is up to the task. The primary and secondary mirrors are fully adjustable, and the structure is stiff enough to hold collimation well across sessions. We do recommend using a laser or Cheshire-style collimator to dial things in, especially if you'll be imaging at full frame or beyond.
What's in the Box:
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10" f/4 Newtonian Optical Tube Assembly (OTA)
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Dual-speed 2" Crayford-style focuser (iEAF compatible)
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2" to 1.25" adapter with compression ring
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CNC-machined tube rings
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Vixen-style dovetail rail
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8x50 straight-through optical finder with bracket
Technical Specifications:
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Optical Design: Newtonian reflector
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Aperture: 254mm (10")
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Focal Length: 1000mm
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Focal Ratio: f/4
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Focuser: 2" dual-speed Crayford, iEAF mounting holes pre-drilled
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Eyepiece Compatibility: 2" and 1.25" (adapter included)
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Mounting: Vixen-style dovetail plate
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Included Finder: 8x50 straight-through
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OTA Weight: Approx. 25.4 lbs (11.5 kg)
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iOptron Part Number: 6313
Visual Observing Tip:
While this scope shines in the imaging world, it’s also an outstanding visual performer. With a low-power 30–35mm wide-field eyepiece, you’ll enjoy immersive views of star fields, bright nebulae, and larger galaxies. Add a high-quality coma corrector and you’ll be surprised how crisp the views stay from center to edge—especially with 2" wide-angle eyepieces.
Imaging Tip:
Fast f/4 reflectors benefit significantly from a coma corrector to deliver pinpoint stars across the entire sensor. Add an iOptron iEAF or other motorized focuser for automatic focusing routines in NINA, SGP, or Ekos, and you’ll have a deep-sky workhorse capable of producing sharp, repeatable results all night long.
