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Radian 61 f/4.5 Imaging APO Telescope


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  • The ultimate portable astrophotography telescope
  • Comes with multiple upgraded components as standard for a complete, turnkey package
  • 61mm aperture, 275mm focal length, f/4.5 system
  • Premier apochromatic triplet optics for pristine image quality
  • Custom Radian Hex Rings with integrated cable management channels
  • Huge full frame image circle with the included Corrector for sharp stars across the image on DSLRs, mirrorless, and dedicated astronomy cameras
  • Comes with a 4" V-style dovetail & a Radian 6.5" universal D-style plate to ensure compatibility with any mount out of the box
  • Additional included accessories consist of a 10:1 factory-tuned rack & pinion focuser, a 2" Filter Vault, a 360º rotator, and more
  • For a limited time get the Universal Astro Spanner Wrench for 40% off with purchase of a Radian 61 Telescope!
  • Check out our Radian 61 Rundown to learn more!

Product Details

  • Radian Raptor 61 Imaging Telescope

    Introducing the Radian 61 Telescope: a premium, travel-friendly APO triplet imaging refractor with all the bells & whistles included for the modern astrophotographer.

    Here at Radian Telescopes, we believe in building gear that works seamlessly with any system, so you can focus on doing what you love — capturing awe-inspiring images of the cosmos — instead of wasting hours fussing with adapters, mounting, and other headaches. That's why we built the Radian 61: a portable, widefield 61mm f/4.5 apochromatic triplet refractor packed with features that any astrophotographer would want for turnkey imaging. Being astrophotographers ourselves, we know how frustrating it feels to have perfectly clear skies overhead but you waste the night trying to get your equipment to work the way it should. With the Radian 61, wasted nights can be a thing of the past. With its wide field of view, the Radian 61 is the ideal choice for producing stunning images of deep sky objects that cover wide swaths of the night sky.




    Radian Raptor 61 Aperture
    • Tack-Sharp, Fast Optics

      We know how agonizing it is to have to spend multiple nights capturing images when using a slow system. With its fast f/4.5 focal ratio, the Radian 61 allows for shorter exposures, making it possible to capture quality data on multiple targets in a single night.
    • High-Quality Glass

      The Radian 61 features an apochromatic triplet optical design with premium glass and multi-coatings to tackle chromatic aberration with ease, leading to an ultra-clean overall image without the nuisance of reflections.
    • Wide Field of View

      The 275mm focal length is simultaneously excellent for widefield imaging and highly forgiving, making it the perfect choice for both beginners and experts. Targets like the entire Veil Nebula and the Orion & Horsehead Nebula together can fit easily into frame on up to full frame sensors.
    • Dedicated Corrector

      With the Radian 61, there's no need to buy an additional reducer/flattener. The dedicated, factory-matched corrector that comes as standard is intended to be used as an always-on solution for imaging. The corrector's three-element design provides correction for sensors as large as full frame, so no matter which camera you use, pinpoint stars can be seen across the image.




    • Factory-Tuned Focuser

      You shouldn't need the world's steadiest hands to nail the focus on your telescope. To bypass this, we chose an ultra-sturdy 2.5" dual-speed rack & pinion focuser for the Radian 61 that's factory tuned to allow extreme levels of precision when focusing. The 10:1 gear ratio of the coarse and fine focus knobs makes nailing tack-sharp focus a breeze for anyone.
    • Upgradeable Automated Focusing

      For those who want to do away with the task of manually focusing altogether, we are pleased to offer the optional USA-made Radian Electronic Focuser as an immediate automation upgrade. We know some prefer not having to second-guess focus accuracy by hand, or would rather control their system from inside on colder nights. The Radian Electronic Focuser's high-resolution stepper motor allows you to adjust focus directly (without an additional focus controller) via software from your computer to ensure you get perfect focus automatically every time.
    • Integrated Filter Vault

      Adding filters to imaging rigs can make figuring out the correct backfocus challenging. The Filter Vault is integrated directly into the Radian 61's included adapters, so you can easily swap out your favorite 2" filters and never worry about spacing or backfocus. Unlike most other telescopes which require an additional filter drawer for an added cost, the Radian 61 has you covered out of the box.




    • Innovative Ring Design

      With a design that hasn't changed in over a century, traditional tube rings can cause you to lose precious hours of imaging time when a cable snags on one of the tightening screws. On top of that, many have wasted time trying to figure out how to attach additional accessories like a guide scope, power box, or other add-ons. To end these issues once and for all, we designed a brand new, innovative set of rings just for the Radian 61: the Radian Modular Hex Rings.
    • No More Snags

      The Modular Hex Rings feature a six-sided construction with mounting holes on all sides to attach any accessory you need, saving you headaches and trips to the hardware store. Cables can be routed through integrated cable channels in the rings for improved cable management. Unlike tightening screws that protrude off of the scope and get caught easily, the Modular Hex Rings have a quick-clamp design that eliminates the possibility of cable snags. 




    • Two Dovetails Included

      We know what it's like to buy a telescope and be ultra excited to receive it, only to find that the dovetail that came with the scope doesn't fit onto your existing mount. For that reason, we decided that the Radian 61 should come standard with both a 6.5" universal Losmandy D-style dovetail and a 4" Vixen V-style dovetail. Having both at your disposal means you can start using your new Radian 61 right away on any variety of mounts you already own.
    • Lightweight

      Forget having to haul your heavy equatorial mount far from home. At a total weight of just 4 lbs (1.8 kg), the Radian 61 can be carried on even the lightest travel mounts, including star trackers like the Sky-Watcher Star Adventurer Pro or the iOptron Skyguider Pro, with weight to spare for a camera as well.





    • Defend from Dew

      Included dew shield helps fend off dew from forming on the objective on humid nights, and front and rear dust covers protect the telescope's optics when not in use.
    • Rotating Made Easy

      Rotating the camera to get the ideal framing has never been simple with many telescopes. On the Radian 61, we chose a built-in 360º rotator that makes it easy to frame your images to your ideal composition without having to rotate the entire telescope.
    • Simple Camera Attachment

      Some telescope manufacturers use proprietary thread sizes on the back, making it difficult to find the right adapters to attach your camera. We chose a simple, industry-standard M48 thread size with full frame sensors in mind for this very reason. Simply attach an M48 wide T-ring with any DSLR or Mirrorless camera and you're ready to image. The threads can also easily be sized down to smaller formats, such as M42, using the adapters that most manufacturers supply with dedicated astronomy cameras.




    • Case Included

      Say goodbye to pricey custom cases and plucking foam when trying to transport your telescope. The Radian 61 comes standard with a Radian travel backpack complete with padded inserts sized for carrying the telescope, a CMOS camera, and a number of other accessories safely when you head out to your favorite dark sky site.


    • Primed for Beginners

      The Radian 61 has features designed with beginners in mind, such as easy camera attachment, both dovetails included, and more. Are you new to astrophotography and need help picking out other gear? Head to our helpful Astrophotography Tips & Techniques page to find everything you need.

    The Heart & Soul Nebulae, captured by Trevor Jones of AstroBackyard with a Canon EOS Ra full frame camera on the Radian 61:


    The California Nebula, captured by Trevor Jones of AstroBackyard with a Canon EOS Ra full frame camera on the Radian 61:



  • specifications

    Back Focus Distance55mm from Rear Threads
    Case StyleRadian Padded Insert Backpack
    CorrectorIntegrated Corrector with three element design
    Dew ShieldIncluded
    Dust CoversBoth front and rear covers included
    Filter Attachment2" / M48 Filter Vault
    Focal Length275mm
    Focal Ratiof/4.5
    Focus Knobs10:1 Dual Speed with Locking Knob
    Image Circle44mm
    Included Dovetails6.5" universal Losmandy D Style and 4" Vixen V Style
    Optical DesignTriplet Refractor
    OTA Length (Dew Shield Retracted)235mm
    OTA Outer Diameter w/o Hex Rings80mm
    OTA Outer Diameter90mm with Dew Shield
    Rear Camera ConnectionM48x0.75 (wide T Ring compatible)
    Rotator360º with Locking Knob
    Tube RingsRadian Modular Hex Rings
    Weight4 lbs
  • included items

    • Radian 61 Telescope
    • Radian padded-insert travel backpack
    • Radian 6.5" universal D-style plate
    • 4" V-style dovetail
    • Radian Modular Hex Rings
    • Filter Vault


Product Reviews

Customer Reviews
4.7 Based on 45 Reviews
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Filter Reviews:
Guillermo G.
United States United States
Primera luz del RADIAN. Simplemente impresionante

Primera fotografía realizada con el Radian 61mm y cámara Atik Horizon a color. El campo de visión es fenomenal, y la calidad de la imagen es fantástica, las estrellas sin aberración cromática y los colores de primera únicamente tiene tomas de calibración con Fats y Darks, así como calibración de color, ningún otro proceso. La imagen habla por si misma. Doctormemo

OPT Telescopes Radian 61 f/4.5 Imaging APO Telescope Review
Richard D.
United States United States
My Astronomy Kit

Haven’t been able to view the Cosmos with my telescope yet. Several parts for my kit are on back order. Received my CEM26 yesterday. So far the Radian 61 & tripod/mount look & feel like really solid pieces of industrial art. Right now my immediate need is to read all the user manuals & cautiously assemble all the parts as they arrive. One thing is certainly apparent: this is no kids toy.

Vladimir G.
United States United States
Realmente todas las soluciones integradas

Es la primera vez que utilizo el Radian61 y estoy cerca de convencerme que es el mejor refractor para campo amplio que he probado. Realmente pensaron en todos los detalles; tiene un aplanador integrado y ofrece un campo con estrellas puntales de esquina a esquina, las imágenes presentan un excelente contraste, y tiene incluido un compartimento para agregar un filtro de 2 pulgadas. Además el backfocus tiene la medida correcta. Por practicidad y por resultado en imágenes considero que es el mejor portátil que he probado.

Charles J.
United States United States
Great scope!

I have had the Radian 61 for about a month and it is every bit as good as advertised. The clamshell mounting rings are a good idea, but there should be an adapter to mount a guide or finder scope, since the threaded holes on the rings have a particular spacing.

Steven R.
United States United States
Good Scope

This is a fine scope. The optics are top notch and works great out of the box with Cannon DSLR. No worry about back focus. The wide field is very forgiving of errors in polar alignment. I bought it as a travel scope option and am very satisfied. I have no issues with the filter vault. The filter drops right in Henry and the adjustable spanner wrench allows it to be tightens without worry of fingerprints on the filter glass. I am very satisfied and first images are extremely satisfying with a modified DSLR.

OPT Telescopes Radian 61 f/4.5 Imaging APO Telescope Review
William H.
United States United States
Update to my previous review

My first review was rushed, I was asked to share pictures and I declined as the two I have are literally my first two astrophotographs. I have since decided that as they are not perfect it's no fault of the telescope. hopefully they might inspire others to share. The first is M31 I only managed about 1 hour of data so not much detail but the core is sharp and clear. The second is the North America Nebula, the color is off as I only have an unmodified Canon rebel T2. Love this telescope!

OPT Telescopes Radian 61 f/4.5 Imaging APO Telescope ReviewOPT Telescopes Radian 61 f/4.5 Imaging APO Telescope Review