Astro-Tech 1X Field Flattener For Astro-Tech AT130EDT Triplet APO Refractor

The AT130EDT is one of the more capable imaging refractors in our lineup — 130mm of FK-61 triplet glass at 910mm f/7, sharp enough to resolve detail that smaller scopes can't touch. But at f/7, the field curves. Stars in the center are pinpoints. Stars at the edges start to elongate and blur. The scope isn't doing anything wrong — every uncorrected refractor does this. A flat sensor and a curved focal plane simply don't agree, and the longer the focal length, the more obvious the disagreement becomes. The AT130EDTFF is a dedicated 1× field flattener that corrects this without changing anything else about the optical system. You keep the full 910mm focal length. You keep f/7. You keep the image scale you chose this scope for. What changes is the field — it goes flat. Stars are round from center to edge across full-frame sensors. The optics the AT130EDT was designed to deliver now reach every corner of your chip. Why 1× Instead of a Reducer? We also make a 0.8× reducer/field flattener for the AT130EDT. That drops the focal length to 728mm at f/5.6 — faster exposures, wider field, but a different image scale. The 1× flattener is for imagers who specifically chose the AT130EDT for…