4.125" Arca-Swiss Lens Plate for Sony FE 100-400mm f/4.5-5.6 GM OSS | Dual-Screw

The Hejnar Photo 4.125-Inch Lens Plate is a high-performance mounting solution custom-engineered for the Sony FE 100-400mm f/4.5-5.6 GM OSS telephoto zoom lens. Featuring a specialized dual-screw mounting system (utilizing both 1/4-20 and 3/8-16 stainless steel captive screws) and an integrated stainless steel QD (Quick Detach) socket, this premium plate provides an unyielding, rock-solid platform that completely eliminates rotational twist on professional tripod heads, ball heads, and gimbal mounts.

Quick Overview & Key Features

• Tailored G Master Fit: Extended 4.125-inch footprint engineered to perfectly match the specific dimensions and base dual-thread configuration of the factory Sony 100-400mm GM lens foot.
• Dual-Screw Mounting Security: Utilizes a high-torque two-screw connection layout featuring one 1/4-20 screw and one 3/8-16 screw to achieve absolute, spin-free lockup.
• Extended Travel Profile: 4.125" rail length provides an expanded fore-aft adjustment travel range, enabling precise neutral balancing on gimbal nodes when deploying varying mirrorless camera configurations.
• Integrated QD System: Incorporates a heavy-duty, stainless steel Quick Detach (QD) receiver socket machined directly into the plate body for instant, secure connection to industry-standard push-button slings and straps.
• Pinless High-Contact Profile: Designed explicitly without an alignment or locating pin, offering maximum flat surface-area contact against the factory foot to optimize structural load distribution.
• Universal Arca Standard: Dovetail configuration ensures total, plug-and-play compatibility with standard quick-release clamp systems from RRS, Kirk, Wimberley, Leofoto, and Markins.
• Fail-Safe Security Stops: Equipped with dual pre-installed bottom safety-stop screws to stop your valuable camera and lens assembly from accidentally sliding out of a loosened tripod clamp.
• Premium Construction & Finish: Precision CNC-machined from a solid block of aircraft-grade 6061-T6 aluminum in the USA and treated with a rugged black hard-coat anodized layer.

SAE Technical Specifications

• Plate Length: 4.125 inches
• Plate Width: 1.50 inches
• Mounting Hardware: One (1) 1/4-20 stainless steel screw and one (1) 3/8-16 stainless steel screw
• Locating Pin: None (Flat unibody plate profile)
• Integrated Socket: Precision stainless steel QD (Quick Detach) receiver socket
• Material Construction: Precision CNC-machined solid 6061-T6 Aluminum
• Exterior Finish: Black Hard-Coat Anodized Surface
• Safety Features: Dual integrated bottom safety-stop screws

Product Description

The dedicated Hejnar Photo 4.125-Inch Lens Plate is a vital technical upgrade for professional photographers utilizing the elite Sony FE 100-400mm f/4.5-5.6 GM OSS lens. This custom accessory seamlessly transforms your factory lens foot into a native Arca-Swiss component, providing a rock-solid connection to your tripod head that completely eliminates the unwanted vibrations, flex, and play associated with generic universal mounting adapters.

Security and equipment protection remain paramount in this design. Because tracking fast-moving wildlife or sports subjects puts significant torsional stress on your support gear, single-screw plates can easily slip or spin out of alignment under load. This rail completely resolves that physical constraint by deploying a robust two-screw mounting system. By locking the plate down utilizing both the 1/4-20 thread and the larger 3/8-16 thread standard on the G Master lens foot simultaneously, it forms an unyielding physical connection that completely eliminates twisting and ensures vibration-free tracking. By intentionally eliminating a locating pin, this plate maximizes flat metal-on-metal contact against the original equipment foot without causing fitment interference.

The core operational feature of this plate variant is the integration of a high-performance stainless steel QD socket. This secure quick-disconnect mechanism—widely trusted for decades by industries around the world including NASA, law enforcement, and military agencies—inhibits accidental removal, allowing you to confidently carry your telephoto setup suspended from a heavy-duty shoulder sling, such as a BlackRapid strap fitted with a push-button QD swivel. When it is time to capture a shot, the push-button mechanism releases instantly, and the low-profile plate slides directly into any standard Arca-type quick-release clamp.