Name: Sony A1, A7RIV, A7V A9II, & A7SIII Base Plate
SKU: RRS-9000472
Price: 115 USD
Availability: InStock

Sony A1, A7RIV, A7V A9II, & A7SIII Base Plate

SKU:

RRS-9000472

UPC:

818413020436

$115.00

Product Details

Product Details

Engineered for a custom fit and feel. Delivering uncompromising confidence in every configuration.

The RRS® Sony Alpha a1 / a7RIV / a9II / a7SIII Series Modular Plate System

When precision and reliability are non-negotiable, nothing less than an engineered solution built for professional use will suffice. RRS modular plates bring decades of proven design and unmatched ruggedness to Sony A1, A7RIV, A9II, and A7SIII cameras, keeping you focused on capturing the moment rather than worrying about your support system.

Sony BA1-B Base Plate on Sony A7R4 camera

Precision Where It Matters. Stability for the Core Camera Setup

The BA1-B base plate provides a precision-fit Arca-style mounting platform designed specifically for your Sony mirrorless bodies. Anti-twist flanges and a captive 1/4"-20 mounting screw create a secure, repeatable clamp interface, giving you confidence on tripods, ball heads, or fluid supports. Laser-engraved centering marks and integrated QD sockets support fast, reliable setup in any shooting scenario.

One System. Endless Configurations

This base plate is the foundation of the Sony Alpha modular system—low-profile yet expandable. It maintains full access to the battery and ports, so you never interrupt workflow when changing batteries or tethering. Use it on its own for lightweight travel or combine it with optional vertical L components for versatile orientations as your shooting needs evolve.

Heirloom Build Quality, Engineered for Longevity

Machined from solid 6061-T6 aerospace-grade aluminum, this L-Bracket is built to withstand the realities of professional use. Advanced CNC machining ensures tight tolerances and exceptional structural integrity, while a Type II hard-anodized finish provides long-term resistance to wear, corrosion, and the elements. Critical fastening points utilize 303 stainless steel hardware, chosen for its strength, corrosion resistance, and reliability under repeated load. The result is a precision tool designed to perform flawlessly in rain, dust, cold, and heat—engineered not just to last, but to be trusted for years of hard use.

Seamless Arca Compatibility, Engineered to RRS Standards

The BGC5 features a precision-machined Arca-style dovetail that conforms to the 1.5" RRS Dovetail Standard for secure, zero-play engagement with RRS and most Arca-type clamps. Integrated RRS-Lock® safety stops add an extra layer of protection against accidental release—keeping your Sony body safe whether mounted on a tripod, ball head, or support system.

Elevate your pursuits with unyielding American craftsmanship

Add the Sony A1 / A7RIV / A9II / A7SIII Base Plate (BA1-B) to your kit for a precision, anti-twist foundation that keeps your camera rock-solid while preserving access and flexibility. It’s an essential building block for any professional support workflow.

Dimension	Full L-Bracket Set	Base Plate
Length	5.6 in. (143 mm)	5.1 in. (129 mm)
Width	2.8 in. (71 mm)	2.7 in. (68 mm)
Height	3.4 in. (86 mm)	0.7 in. (19 mm)
Weight	5.2 oz (147 g)	3.0 oz (84 g)
Slot Travel Length	N/A	0.9 in.(23mm)
Country of Origin
More Info
Compatible Bodies	A1, A7RIV, A9II, A7SII, A7V