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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. This field flattener requires 55 +/- 0.5mm (standard DSLR) back focus. When using a CCD camera, the remaining back focus required can be made up with 42mm extension tubes.
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