Product Details

• Description
• Specifications
• Included Items
• Reviews

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  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.

   

   

  FAST F/4.5 FOCAL RATIO WITH SUPERIOR CORRECTION
  

  
  

  

  • 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.

   

   

  MADE FOR ASTROPHOTOGRAPHERS, BY ASTROPHOTOGRAPHERS
  

  
  

  

  • 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.

   

   

  RINGS: REBORN
  

  
  

  

  • 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. 

   

   

  MOUNTING & WEIGHT
  

  
  

  • 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.

   

   

   

  ADDITIONAL FEATURES
  

  
  

  

  • 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.

   

   

  TAKE IT ANYWHERE
  

  

  • 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:

  

   

  Watch AstroBackyard's Video on the Radian 61:

   

• specifications

  Aperture	61mm
  Back Focus Distance	55mm from Rear Threads
  Case Style	Radian Padded Insert Backpack
  Corrector	Integrated Corrector with three element design
  Dew Shield	Included
  Dust Covers	Both front and rear covers included
  Filter Attachment	2" / M48 Filter Vault
  Focal Length	275mm
  Focal Ratio	f/4.5
  Focus Knobs	10:1 Dual Speed with Locking Knob
  Image Circle	44mm
  Included Dovetails	6.5" universal Losmandy D Style and 4" Vixen V Style
  Optical Design	Triplet Refractor
  OTA Length (Dew Shield Retracted)	235mm
  OTA Outer Diameter w/o Hex Rings	80mm
  OTA Outer Diameter	90mm with Dew Shield
  Rear Camera Connection	M48x0.75 (wide T Ring compatible)
  Rotator	360º with Locking Knob
  Tube Rings	Radian Modular Hex Rings
  Weight	4 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