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0.92x Field Flattener / Reducer for all APOs 2 Glass Elements ED 55mm Back Focus, adjustable T2 AP85 to 469mm f/5.5 AP95 to 529mm f/5.5 AP106 to 644mm f/6 AP140 to 837mm f/6 AP152D to 690mm f/4.6 AP204 to 1314mm f/6.4
Recommended for APS and smaller sensors.