Arca-Swiss Quick Release Plate | Designed for Pentax 645 FA 300mm & DA 60-250mm

The Hejnar Photo Premium Lens Plate is a high-performance mounting solution custom-engineered explicitly for medium format and telephoto zoom optics featuring an indexing alignment channel, including the Pentax 645 FA 300mm and the Pentax DA 60-250mm (K-mount). This precision-machined plate provides a native Arca-Swiss dovetail profile on its base, allowing your lens to interface directly with professional ball heads, gimbal mounts, and quick-release clamps. Featuring an integrated removable anti-twist locating pin and a rugged stainless steel captive tie-down screw, it offers the uncompromising stability required for professional sports, landscape, and studio photography workflows.

Quick Overview & Key Features

• Tailored Pentax & Universal Alignment: Base footprint and indexing configuration are meticulously balanced to anchor the Pentax 645 FA 300mm and DA 60-250mm lens collar feet perfectly square.
• Anti-Twist Locating Pin: Features an integrated registration locating pin that keys directly into the lens foot alignment hole, completely stopping twisting under heavy tracking leverage.
• Universal Anti-Marring Pad Surface: Flat, high-traction mounting bed maximizes direct metal-on-metal alignment contact against your factory collar foot for enhanced dampening.
• Streamlined Arca Mount: Milled with a single, low-profile Arca-Swiss dovetail profile on the base for maximum structural rigidity, tight center-of-axis geometry, and clear clamp clearance.
• Universal Standard Fit: Standard dovetail geometry ensures total, plug-and-play compatibility with 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 receiver.
• Premium US 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 for advanced wear resistance.

SAE Technical Specifications

• Plate Profile Length: 3.00 inches (Optimized for balanced lens footprint track)
• Plate Width: 1.50 inches
• Mounting Hardware: One (1) captive-style 1/4-20 stainless steel screw and one (1) removable locating indexing pin
• Material Construction: Precision CNC-machined solid 6061-T6 Aluminum
• Exterior Finish: High-Durability Black Hard-Coat Anodized Surface
• Safety Features: Dual integrated bottom safety-stop screws

Product Description

The dedicated Hejnar Photo Arca-Swiss Lens Plate with Locating Pin is an essential technical upgrade for photographers deploying substantial telephoto zoom and medium format lenses like the legendary Pentax 645 FA 300mm prime and the Pentax DA 60-250mm K-mount zoom. Because panning and tracking fast-moving subjects puts immense rotational force and twisting pressure on your camera support train, generic universal single-screw plates can easily slip or spin out of square on the tripod foot. This custom plate completely resolves that physical vulnerability by deploying a dedicated anti-twist locating pin assembly. By capturing both the primary 1/4-20 thread and the factory indexing hole simultaneously, it forms an unyielding connection that guarantees absolute tracking squareness.

The generous 3.00-inch total rail length provides a useful fore-aft travel adjustment window inside your tripod head quick-release clamp. This structural track lets you shift your camera package smoothly back or forth to locate a perfect neutral center of gravity on a gimbal node or ball head, which helps eliminate front-heavy nose-diving and dampens focal micro-vibrations for sharper long-exposure captures. For maximum versatility, the alignment pin is completely modular and can be removed or relocated if you wish to adapt the plate profile to other traditional telephoto lens collars that rely solely on flat surface friction.

Bespoke-crafted in the USA from solid aircraft aluminum and packed with professional fail-safes, this lens plate is engineered to survive and perform across punishing outdoor assignments. The low-profile cylindrical screw head houses a deep, precision-milled internal drive socket that accommodates standard hex keys, allowing you to deliver massive manual leverage for a permanent lockup. Finished with a rugged black hard coat built to withstand field transport scuffs, this accessory delivers the technical precision and lifelong field reliability your high-end optics deserve.