The Really Right Stuff BA1 camera body plates are custom designed for the most secure fit as possible on the Sony Alpha-1, A7RIV, A7SIII, and A9II. Each plate is precision machined from solid blocks of 6061-T6, aircraft grade aluminum.
The Sony A1 camera plate is fully compatible with any standard 1.5"-dovetail style quick-release system. The plate also has contoured anti-twist flanges for a perfect fit, which prevents twisting between the cameras and plate. The BA1 quick-release plates utilize a custom machined 1/4"-20 threaded, captive-style mounting screw that threads into the tripod mounting socket of your camera body.
As part of a modular system, the BA1 plate still functions as a traditional camera mounting plate, but also has the added flexibility of accepting a separate dedicated vertical L-Component to create a fully modular L-Plate with two dovetail mounting surfaces.
The BA1 plate system is compatible with the Sony A1, A7RIV, A7SIII, and A9II.