This full frame field flattener comes with a large threaded adapter for a 3.5" Feather Touch focuser and other large focusers that use a 4.125"-24 thread. Merely un-thread the endcap on the focuser and thread this entire unit in place. This flattener is designed to accommodate the standard 55 mm backfocus and the standard M48 thread. If your camera has a different backfocus or a different thread size don't worry. Just call us at (530) 823-7796 and chances are we can assemble one of these that meet your requirements. We have over 100 different adapters and extensions in stock!
This particular flattener and adapter will work with apo refractors in the 127 - 132 mm range that are between f-6.8 and f-7.