Description
Can I use this flattener with the AT115EDT?
No. Use the AT115EDTRFv3 or the equivalent 1 flattener matched to the AT115EDT. Each flattener is designed for the specific optical geometry of its scope using the AT130EDT version on the AT115EDT will not produce correct field correction.
Final Thoughts
The imager who buys this already knows what 910mm f/7 gets them. They’re not looking for more sky they’re looking for sharper sky. The AT130EDT is a triplet that delivers excellent color correction and a long, precise focal length. The field curvature is the one thing it can’t solve on its own. The AT130EDTFFv3 solves it, across a 60mm corrected circle that no sensor you’re likely to own will outgrow. If you’ve been getting good data from the center of your frame and watching the corners drift soft this is the fix. One piece of glass, correctly spaced, and the scope you already own starts performing the way it was always capable of performing.
Tech Details:
| Model | AT130EDTFFv3 |
| Compatible Telescopes | AT130EDT (3.2″ focuser), AT130EDX (3.7″ focuser) |
| Magnification Factor | 1.0 (no focal reduction) |
| Native Focal Length Preserved | 910mm f/7 (AT130EDT/EDX) |
| Corrected Image Circle | 60mm |
| Scope Connection | M92 male |
| Camera Connections | M781 female, M540.75 male, M480.75 male |
| Back Focus | 55mm (flattener shoulder to sensor) |
| Filter Threads | Internal 2″ (48mm) beneath top optical cell |
| Coatings | Fully multi-coated, broadband AR |
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