Description
A quality diagonal is essential for a scope at this level. The dielectric coating delivers near-total reflectivity you won’t lose light to the diagonal.
Final Thoughts
The AT150EDL is for the observer or imager who wants six inches of clean refractor aperture and has been watching the triplet prices and thinking: there has to be another way. There is. The FCD-100 and lanthanum doublet at f/8 delivers color correction that Sky & Telescope couldn’t distinguish from triplet performance at the eyepiece. The mechanicals focuser, rings, dovetail, collimatable cell are shared with the AT152EDT triplet and are genuinely premium. The hard case, while heavy, protects the investment. Owners on Cloudy Nights have put 315 posts into the main owners thread and the consensus is clear: this scope punches well above its price. If you’ve been dreaming about a big refractor and assumed it was out of reach, the AT150EDL is the scope that changes that math.
Tech Details:
| Aperture | 150mm (5.9″) |
| Focal Length | 1200mm |
| Focal Ratio | f/8 |
| Optical Design | Air-spaced ED doublet (FCD-100 + lanthanum) |
| Optical Coatings | Fully multi-coated (all air-to-glass surfaces) |
| Strehl Ratio | Guaranteed minimum 0.95 |
| Lens Cell | Precision-machined, collimatable (push-pull adjustment) |
| Internal Baffles | 6 knife-edge baffles + micro baffles in focuser drawtube; hand-blackened lens edges |
| Focuser Type | 3.2″ dual-speed rack-and-pinion (helical gears) |
| Fine Focus Ratio | 10:1 |
| Total Back Focus | 150mm |
| Focuser Rotation | 360 body rotation on OTA + 360 camera angle adjuster |
| Accessory Holders | 2″ and 1.25″ compression ring (brass); includes 1.25″ adapter |
| Focuser Lock | Solid focuser lock (no image shift) |
| Dew Shield | Retractable, 170mm diameter, extends 22cm beyond objective |
| Tube Finish | Pearl-white paint |
| Overall Length (dew shield extended) | ~43.5″ (1105mm) |
| OTA Weight | 20.5 lbs (9.3 kg) |
| Total Weight (with rings, dovetail, handle) | 25.05 lbs (11.4 kg) |
| Mounting System | CNC machined tube rings + 13″ Losmandy D-style dovetail plate |
| Carry Handle | CNC machined (doubles as 18cm Vixen-style mounting bar) |
| Finder Shoe | Synta-standard (on focuser) |
| Storage Case | Hard-sided, foam-lined, 3 handles, 3 locking hasps |
| Shipping Weight | 72 lbs (33 kg) |
| Warranty | 1 year |
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