This 3.5-inch Field Flattener for the 130 Starfire GTX is redesigned from the original version to better utilize the optics of your telescope. Accommodates even the largest sensors such as the KAF-50100.
Can be used on prior 130EDFGT upgraded to the 3.5-inch Focuser.
With backfocus spacer - 80.8 mm +/- 2.5mm
Without backfocus spacer - 102.9 +/- 2.5 mm