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Really Right Stuff Base Plate for Sony a9 III

BH #REBPSA9III • MFR #RRS-9000537
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Really Right Stuff Base Plate for Sony a9 III
Camera Not Included
Key Features
  • Arca-Type Compatible Dovetail Plate
  • Modular Design
  • Adds Quick Release Functionality
  • Anti-Twist Flanges
The Base Plate for Sony a9 III from Really Right Stuff is designed with anti-twist flanges to keep the camera from twisting while mounted on the plate. It is compatible with any standard 1.5" dovetail quick release system. The 6061-T6 aluminum plate maintains complete access to the battery door, and the plate has an option for an available L-component that fits its modular design to create a custom-fit L-plate. The base plate has a durable Type II anodized finish and a laser-engraved center mark on the rear to align it on a tripod head.
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Really Right Stuff RRS-9000537 Overview

The Base Plate for Sony a9 III from Really Right Stuff is designed with anti-twist flanges to keep the camera from twisting while mounted on the plate. It is compatible with any standard 1.5" dovetail quick release system. The 6061-T6 aluminum plate maintains complete access to the battery door, and the plate has an option for an available L-component that fits its modular design to create a custom-fit L-plate. The base plate has a durable Type II anodized finish and a laser-engraved center mark on the rear to align it on a tripod head.

  • Wraparound grip matches camera body contours
  • Anodized Type II Black
  • Laser engraved center marks
  • Integrated socket for QD strap systems
  • Anti-twist pin provides extra secure fit
  • Integrated steel QD socket
  • Side port doors can opened without sliding the L-component out
UPC: 810121631027

Really Right Stuff RRS-9000537 Specs

Quick Release Plate
Mounting
1x 1/4"-20 Male
Strap Loop
No
General
Quick Release Plate Type
Arca-Type
Quick Disconnect System
QD
Bubble Level
No
Materials
Aluminum
Dimensions
5.1 x 2.7 x 0.56" / 129.5 x 68.6 x 14.22 mm
Weight
3 oz / 84 g
Packaging Info
Package Weight
0.395 lb
Box Dimensions (LxWxH)
6.3 x 4.8 x 2.8"

Really Right Stuff RRS-9000537 Reviews

Not perfect but good enough.

By Christopher
Rated 4 out of 5
Date: 2025-12-09

It fits perfectly on my a1ii and will do the job: provide an arca swiss mount, protect the camera bottom, and provide an attachment point for a camera strap anchor. I think the battery swing out piece could have been designed better. The similar SmallRig baseplate for my Sony a7iv was finished in the same texture as the camera body, was made better, and was half the price. I was scared off by the 3 star reviews, but I was at B&H today and got an in-person look at this piece. It’s not perfect but will do the job. In the end, I am happy with the purchase and would recommend this product even though a few tweaks could make this a 5 star item.

It works

By Mark
Rated 3 out of 5
Date: 2025-10-17

IMHO this is the best base plate for the Sony A1 Mk2. I tried the Kirk 'universal' and it interfered with the monitor swing. The gate to access the battery compartment should have been omitted, just make the base accommodate it. I have NOT tried the 'L' plate attachment.

See any errors on this page?

Shall this fit SONY A1 II?

Shall this fit SONY A1 II?
Asked by: YI
Yes, the Really Right Stuff Base Plate for Sony a9 III also fits the Sony a1 II.
Answered by: Stephen M
Date published: 2025-09-27
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