This Arca-Type Quick-Release Plate from Acratech is compatible with select Canon, Nikon and Sony DSLRs and with most Arca-Swiss compatible release clamps. It's machined in the USA from 6061 T-6 aluminum and it features an anti-twist lip that prevents camera rotation. The plate has a satin black anodized finish and a standard 1/4"-20 camera mounting thread.
Canon 40D, 50D
Sony A300 with VG-B30AM Battery Grip