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Stellarvue SFF-3 Field Flattener

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Stellarvue SFF-3 Field Flattener for refractors, threaded metal dust caps
supports Full Frame image circle, >43mm
63mm male threaded fit to Feathertouch (or Stellarvue) 2.5", can use adapter for other large focusers
Camera side is M48 male threads
optimized for 800mm focal length objective, but should work perfectly fine for FL of 630 - 970mm
$195 plus $15 shipping (US only) plus PP fee