Astro-Tech 1X Field Flattener For Astro-Tech AT115EDT Triplet APO Refractor

The AT115EDT has become one of the most popular imaging refractors we sell — 115mm of FK-61 triplet glass at 805mm f/7, enough aperture and focal length to frame mid-size deep-sky targets with real detail. But like any refractor at f/7, the field curves. Stars in the center are sharp. Stars at the edges stretch. That's not a flaw in the scope — it's what a curved focal plane does to a flat sensor. And it's exactly what a dedicated field flattener is designed to fix. The AT115EDTFF is a 1× flattener built specifically for the AT115EDT. It doesn't reduce the focal length or change the focal ratio — you keep the full 805mm at f/7. What it does is flatten the field so stars are round and sharp from center to edge across your entire sensor, including full-frame chips. The AT115EDT delivers the light. The flattener makes sure that light lands correctly on every part of your sensor. Why 1× Instead of a Reducer? The AT115EDT has a strong following among imagers who value its 805mm focal length for the image scale it provides. At 805mm, mid-size targets — the Rosette Nebula, the Crab Nebula, galaxy pairs, the Veil complex — have enough scale to show structural detail without being too…