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Sony A9 Modular Plates

SKU BA9 Base Plate


| The BA9 plate system is compatible with the Sony A9, A7III, and A7rIII |

Really Right Stuff camera body plates are all custom designed for each camera body and precision machined from solid blocks of 6061-T6 aluminum. Fully compatible with 1.5" RRS dovetail standard, our plates feature precisely contoured anti-twist flanges for a perfect fit that prevents twisting between the camera and our plate. All of our 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, this conventional base 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. You can purchase the dedicated vertical L-component as a separate add-on, or as a set package with the base plate.


  1. CNC machined 6061-T6 aluminum
  2. Anodized; Type II Black
  3. 1/4"-20 threaded accessory mounting socket
  4. Laser engraved center mark
  5. RRS dovetail standard


Country of Origin: USA
Base Plate
  1. Length: 5.02"/ 128mm
  2. Height: 0.65"/ 17mm
  3. Width: 2.41"/ 61mm
  4. Weight: 3.32oz/ 94g

In the Box

Base Plate
  1. (1) Sony Alpha a9 base plate
  2. (1) Integrated rubber gasket for battery door
  3. (1) Custom 1/4"-20 x 0.4" captive button head screw
  4. (1) 5/32 hex key