Description
The AT66EDQR 0.8 reducer (sold separately) reduces the focal length from 462mm to approximately 370mm and the f/ratio from f/7 to f/5.6roughly 36% faster. That’s a meaningful gain for narrowband or emission nebula imaging where photon-gathering speed matters. The flat-field correction holds with the reducer attached.
Is this a visual scope or an imaging scope?
It’s designed for imaging. The quadruplet flat-field correction, threaded drawtube, built-in rotator, and autofocuser compatibility are all imaging-oriented features. That said, the views through a quality 2″ wide-field eyepiece are excellentsharp, color-free, and high contrast. It performs genuinely well for visual work, especially wide-field sweeping and star clusters. It just happens to excel at imaging.
What mounts work with it?
At 3.6kg with rings and handle, it fits comfortably on light-to-medium equatorial platforms. Harmonic drivesZWO AM5, iOptron HEM27, Rainbow Astro RST-135are ideal. The Sky-Watcher Star Adventurer GTi handles it without strain. Heavier mounts (HEQ5, EQ6-R) have no trouble either. It works with standard Vixen-style and Losmandy-style dovetail saddles via the included tube rings.
Tech Details:
| Aperture | 66mm |
| Focal Length | 462mm |
| Focal Ratio | f/7 |
| Optical Design | Quadruplet apochromatic refractor, air-spaced |
| ED Glass | 2 elements (FK-61 + proprietary) |
| Image Circle | 43.2mm (full-frame) |
| Focuser | 2.8″ dual-speed rack-and-pinion, 10:1 fine focus |
| Focuser Threading | M63, M54, M48 male; 2″ compression ring adapter |
| Focuser Rotation | 360 built-in angle adjuster |
| OTA Length (retracted) | 343mm (13.5″) |
| OTA Length (extended) | 420mm (16.5″) |
| Weight (with rings & handle) | 3.6kg (7.9 lbs) |
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