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If it's the 2.5 inch flattener then this will help
Refractors with a focal length up to 500 mm 106 mm distance
Refractors with a focal length between 501 mm and 600 mm
101 mm distance
Refractors with a focal length between 601 mm and 700 mm
96 mm distance
Refractors with a focal length between 701 mm and 800 mm
91 mm distance
Refractors with a focal length between 801 mm and 950 mm
88 mm distance
Refractors with a focal length above 1000 mm
87 mm distance
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