Astro-Tech AT130EDX f/7 FCD100 ED Triplet APO

Description

, the FCD100 triplet produces tight, color-free star fields that stack cleanly. The 3.7″ focuser and M92/M68 threads let you build a rigid imaging train with no adapter flex. At f/7, sub-exposure times are reasonable for broadband work, and the flat field produced with the matched V3 flattener or reducer covers full-frame sensors edge to edge. The pre-tapped EAF mount puts autofocus one connection away.

Observing Tip

Don’t overlook the removable tube section. Binoviewers typically require added optical path to reach focus, and most scopes need a Barlow to get there which changes magnification and adds glass to the light path. The AT130EDX lets you remove 100mm of tube and reach focus natively with most binoviewers. The result is brighter, higher-contrast two-eye views at the magnification you chose, not the magnification the Barlow imposes. If you own binoviewers and haven’t tried them on a premium refractor without a Barlow, this scope will change your mind about what binoviewing can do.

Community Says

The AT130EDX comes up regularly in Cloudy Nights comparison threads often against scopes costing significantly more:

“The AT130 EDX is also bino-friendly, 10mm more glass than the TSA120, and with a better focuser… Never liked that the Askar’s would not list the ED glass used. Perhaps good scopes, but when someone is paying thousands of dollars I believe they have a right to know what they are paying for.”

“I also would recommend the AT130 EDX. I have an excellent Askar but it was hand selected otherwise it is a lottery.”

“For the planets, the optical quality of the APM 140 fast doublet and the low priced Askar 140 is not going to compete with the 130EDX with its optical quality guaranteed minimum Strehl… Of the telescopes on your list, I would pick the 130EDX. I think the difference in double star observing with the 140’s greater aperture over the 130EDX will NOT be that noticeable. But, when planetary observing, the 130s higher optical quality WILL BE noticeable when compared to the two 140s.”

Frequently Asked Questions

What makes the AT130EDX different from the AT130EDT?
Different glass, different focuser, different tier. The EDT uses FK-61 (our FPL-51 equivalent) and a 3.2″ focuser. The EDX uses Ohara FCD100 with a lanthanum mating element, tested to a guaranteed minimum 0.95 Strehl at 532nm, and a 3.7″ focuser with a 15-lb payload. The EDX adds dual M92/M68 focuser threads, a removable binoviewing section, knife-edge baffles, and a fitted hard case. The EDT is an excellent scope for its price point. The EDX is our best refractor, period.

How does the AT130EDX compare to the Takahashi TSA-120?
Both are premium refractors. The TSA-120 is a beautifully made 120mm scope with a legendary reputation. The AT130EDX gives you 130mm of aperture 10mm more glass with a larger focuser (3.7″ vs. Tak’s 3.3″) and native binoviewing capability. The FCD100 triplet provides comparable color correction. The AT130EDX offers more aperture, higher payload capacity, and more mechanical features at a similar price point. We sell both each is an excellent scope for a slightly different buyer.

Can I use the AT130EDT’s reducers and flatteners with the EDX?
Yes. The V3 0.8 reducer/field flattener (AT130EDTRFv3) is compatible with both the AT130EDT and the AT130EDX it connects via M92 thread to the focuser drawtube. The EDX’s M68 thread provides an additional connection option for M68-based accessories.

What mount do I need?
The AT130EDX weighs 24.55 lbs with rings, dovetail, and handle. Add a camera, filter wheel, and guide scope for imaging, and you’re looking at 2830 lbs of payload. A mount rated for at least 40 lbs of imaging payload is recommended something in the HEQ5 Pro / EQ6-R / iOptron CEM40 class or above. For visual use, you can run lighter since tracking accuracy is less critical, but the mount still needs to handle 25+ lbs comfortably.

Does it come with eyepieces?
No the AT130EDX is an OTA (optical tube assembly) only. It includes tube rings, Losmandy dovetail, carry handle, and hard case. You supply eyepieces, diagonal, and mount.

Is the focuser motorizable?
Yes. The focuser housing has pre-tapped holes for mounting a ZWO EAF or most popular motorized focus systems directly. No custom bracket fabrication needed.

Final Thoughts

The AT130EDX is the scope we’ve been building toward for forty-five years. Not the most affordable refractor in the catalog that was never the point. This is the one where the glass, the focuser, the mechanical details, and the optical testing all meet the same standard. If you’ve owned a good 80mm or 100mm APO and wondered what the next level looks like, this is it. If you’re comparing 130mm and 140mm refractors across brands and price points, look at what’s included in the box, what glass is in the tube, and whether the optics are tested before they ship. The AT130EDX answers all three.

Tech Details: