Description
The Astrodymium Ring System is an all in one mounting & autofocusing solution to using the Rokinon/Samyang 135mm F2 lens for astrophotography.
The ring system allows a ZWO ASIAIR, EAF, and any guidescope to be easily attached to the 135mm lens, making it a versatile tool for capturing stunning astrophotography images.
Stop Wasting Clear Nights, and Get Hassle-Free Imaging With Autofocus Instead
Imagine pressing one button at the start of the night, and waking up to flawless sub-exposures. Yes, this could be you. No more manually focusing in the dark, and no more ruined nights caused by bad focus! Powered by a ZWO EAF, and a reliable backlash-free belt drive.
Mount an ASIAIR + Guidescope (and other astro accessories)
Get longer exposures, and throw away less images with the power of autoguiding! Easily attach a guidescope, and accessories to your Rokinon lens, like an ASIAIR Plus/Mini (with the optional mounting plate add-on). Alternatively, you can purchase another rail and attach any astro accessory that has a vixen style dovetail instead.
Rotate Your Entire Setup in Seconds, No Tools Required!
You can have your cake and eat it too. The unique design of the focus ring easily allows you to disconnect the belt and reconnect it in mere seconds. You won't be locked in a single position anymore.
Used by Over 2000 Astrophotographers in 35+ Countries
"⭐⭐⭐⭐⭐I had my doubt when it comes to 3D printed parts. Happy to say I was very impressed by the design and quality of this ring system. All parts are precisely made and fit together perfectly. Almost all screw sockets are metal and very secure. It also has one of the best written instruction manuals to put everything together." - JUN
There's a reason why Astrodymium is trusted by astrophotographers around the world. All parts for the Ring System are made in Canada, and use high quality stainless steel / aluminum parts where possible.
Quick and Convenient to Install and Remove
Two rings securely hold your lens, and have an innovative design that keeps the thumbscrews in place so they don't fall out.
All parts for the Ring System are made in Canada, and 3D printed out of durable PETG plastic that can handle temperatures of up to 80C (176F), and down to -25C (-13F). Each threaded point uses stainless steel threads for a strong and corrosion resistant connection.
Screws for connecting the rings to a dovetail bar/plate are included.
Astrodymium Ring System is compatible with:
- Rokinon 135mm F/2
- Samyang 135mm F/2
- Walimex 135mm F/2
- All CINE versions of the above lenses (you need a special part to use the cine versions, please contact me after you order to receive this)
What's included with all configurations:
- 1x Set of rings (front + rear) and guidescope rail
- 2x M3x12mm stainless steel thumbscrews
-
2x M5x12mm button head screws
-
2x M6x16mm socket head screws (You'll receive longer screws if you purchase the riser blocks add-on)
-
ZWO EAF Mount for Astrodymium Ring System:
- Fasteners
- Printed Parts
- 1x Timing belt
- 1x Metal pulley
- Instructions are provided inside the box as an online manual
Visit the product pages for each add-on to learn more information about them:
| Name: | SKU: |
| Vixen & Arca-Swiss Style Dovetail Bar | RS-DBAR |
| Riser Block Kit | RS-RISER |
| Flat Mounting Plate for ZWO ASIAIR Pro & PPB Micro | RS-FMP |
| Accessory Rail | RS-AR |
| ZWO EAF Adapter / Mount / Bracket | RS-EAF-STANDALONE |
Videos from customers!
Shipping Information
Payment & Security
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Estimate shipping
Customer Reviews
This is the second set up I’ve made with Astrodymium and as always… I am pleased and will continue to use their products.
Honestly, the worst decision I made in my astrophotography journey was waiting this long to get it. This thing is a total game-changer. For the price? One of the best value-for-money purchases I’ve made—no question.
It opens up so many more framing possibilities now that I can rotate both the camera and the lens. That flexibility has completely changed how I compose my shots—it’s incredibly useful.
Assembly was super quick. I’m the kind of person who checks every step twice, and it still only took me 15 minutes to get everything in place.
Shipping? Ridiculously fast. The only delay was a flight issue during transport—not the seller’s fault at all.
The finish is clean and solid. You can tell it was made with care and precision. Even if it’s not built from industrial materials, it feels thoughtfully designed and absolutely reliable.
And the support? Just excellent. I sent a few questions before buying and got helpful, friendly replies in no time. That kind of attention makes a huge difference.
My only regret? That this seller doesn’t offer more gear. I wouldn’t think twice about buying again.
Highly recommended. If you're considering it, this is one of those purchases you’ll genuinely be glad you made.
Really goog ring system, work perfectly with my setup.
The title says it all. The ring design is excellent. It accommodates an EAF and can mount two other devices (ASIair, mini pc, pegasus ppb, etc). That said, the print quality of the ring system is stunningly poor. I made better prints when I first started printing using a cheap $100 printer. Very disappointing. I would rather have just paid for the file and printed it myself. All in all, it works.
Easy to assemble the rig and dose all you want it to.
Equipment is safe and secure.
Follow the Instructions (Read along as you go).