Description
If you own the AT115EDT and you’re imaging, this is the most efficient upgrade available to you. No new scope, no new mount, no new camera just one precision element threaded into the focuser drawtube, and your 805mm f/7 triplet becomes a 644mm f/5.6 astrograph with corrected field corners. The targets that were slightly too large to frame at native focal length the Heart Nebula, the Rosette, the great Cygnus emission fields move into range. The exposures run a third shorter. And the field flattener that the AT115EDT optical design never included, because triplets don’t, gets quietly supplied. It’s a logical completion of a scope that was already doing most things right.
Tech Details:
| Model | AT115EDTRFv3 |
| Compatible Telescope | Astro-Tech AT115EDT (3.2″ focuser) |
| Focal Reduction | 0.8 |
| Original Focal Length | 805mm |
| Reduced Focal Length | 644mm |
| Resulting Focal Ratio | f/5.6 (from f/7) |
| Corrected Image Circle | 43.8mm (full-frame) |
| Scope Connection | M92 male |
| Camera Connections | M781 female, M540.75 male, M480.75 male |
| Back Focus | 55mm (reducer shoulder to sensor) |
| Filter Threads | Internal 2″ (48mm) in upper optical element |
| Coatings | Fully multi-coated, broadband AR |
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