42mm 大型写真用フラットナー 2.5インチフォーカサー対応 (SFF3-25-42)

My Tak FSQ-106's stars were always bloated in the corners until I added this flattener. The threads on the 42mm attachment ring are buttery smooth and it locked onto the focuser without any tilt. Corners are now sharp across the entire full-frame sensor.

Threaded right onto my 2.5” focuser without any adapters needed, and the 42mm attachment covers my full frame sensor perfectly. Corners look flat and sharp at f/7, exactly what I hoped for with my refractor.

Crisp stars right to the corners of my full-frame sensor with this flattener, and the 42mm clear aperture doesn’t vignette at all. I’m getting round stars across the entire field now, even with my f/7 scope.