Cloud Break Optics

42mm Large Photographic Field Flattener for 2.5" Focusers (SFF3-25-42)

42mm Large Photographic Field Flattener for 2.5" Focusers (SFF3-25-42) - Main image
$185.61 $269 In stock

Category: Astrophotography Accessories

Description

Large Chip flattener for 2.5” focusers - 42 mm attachment

This flattener is made for our f-7 refractors. It threads to the rear of the 2.5" Stellarvue or Feather Touch focusers. This flattener uses the standard T-thread (42 mm) to attach to the camera. This provides a completely threaded mounting solution for cameras when using a 2.5” focuser. When using a CCD astro camera, spacer rings and/or extension tubes may be required. 

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (5.0 / 5 · 5 reviews)

Eva S. ★★★★★

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.

Jacob J. ★★★★★

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.

Henry E. ★★★★★

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.

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