Sirui HA-77 Horizontal Arm (AS-IS)

Sirui HA-77 Horizontal Arm / Telescoping Extension Boom
The Sirui HA-77 is a highly versatile, telescoping cross arm that mounts to any standard tripod or support system featuring a 3/8″-16 screw. By extending your camera outward or upward, it transforms a conventional tripod into a miniature camera boom or crane. Crafted from durable aluminum alloy, this arm enables smooth 360° pan rotation and a 90° tilting range, making it an indispensable tool for copy stand work, overhead flat-lays, macro photography, and tracking unique low or high angles while keeping the operator comfortably positioned.

CONDITION NOTE
Missing Component / Sold AS-IS: This unit is in good exterior cosmetic condition but is missing the front flat plate/base required to attach a camera or tripod head. Because it is missing this crucial mounting hardware, the item is being sold strictly AS-IS for parts, repair, or for users who already source an external replacement plate.

Versatile Boom Functionality & Positioning
Telescoping Extension Reach: Features a dual-section tube framework that expands smoothly from 19.7 inches to a total maximum length of 30.3 inches, giving you the clearance needed to extend your camera past the footprint of your tripod legs.

360° Fluid Pan & 90° Pivot Tilt: Supported by an independent panoramic base offering 360° swiveling, connected to a sturdy fulcrum that moves 90° upwards or downwards. This lets you quickly lift your camera over a scene or drop it close to the ground for low-angle perspectives.

Precision Engraved Grids: For highly technical macro or copy work, the first tube section features hatch marks engraved at 0.5cm intervals (from 0–30cm), the second section spans 0–27cm at 0.5cm steps, and the tilt fulcrum features tactile indicator markers at 10° steps.

Tactile Twist & Thumbscrew Locks: Outfitted with robust thumbscrew locks across the panoramic base, tilt fulcrum, and telescoping collar for immediate adjustments, paired with a quick-turn twist lock on the barrel for fast section deployment.

Balance System & Dual-Device Customization
Counterbalance Ballast Hook: The rear of the main arm features a removable foam-padded grip terminating in a heavy-duty ballast hook. This allows operators to hang weights, packs, or sandbags to perfectly offset the payload leverage at the front of the boom.

Dual-Camera Conversion Potential: The foam handle can be unscrewed from its 3/8″-16 thread and replaced with a secondary Sirui mounting base (sold separately), allowing you to rig two parallel cameras or dual devices onto a single tripod footprint.

Compact Breakdown & Built-In Tooling
Ultra-Compact Travel Profile: When fully collapsed, folded down, and packed for storage, the arm measures a compact 14.6 x 5.3 inches, allowing it to tuck easily into gear bags.

Integrated Storage Mode: The 3/8″-16 threads on the padded handle allow it to be unscrewed from the primary tube and threaded straight into the accessory block for streamlined transport.

Clever On-Board Tools: The tip of the handle’s 3/8″-16 stud and the removable ballast hook are both meticulously shaped to double as functional hex keys, letting you remove or adjust structural plates in the field without carrying extra loose tools.

Included Items
Sirui HA-77 Horizontal Arm (Aluminum Alloy)

Removable Foam-Grip Handle with Integrated Ballast Hook

Two (2) Fulcrum Retaining Screw Hex Keys

One (1) General Assembly Hex Key

Protective Drawstring Storage Pouch

Please Note: Missing the front camera/head mounting base plate.

Technical Specifications
Material Composition: High-Grade Aluminum Alloy

Total Extension Range: 19.7″ to 30.3″ (50 cm to 77 cm)

Folded Storage Dimensions: 14.6″ x 5.3″ (37 cm x 13.5 cm)

Maximum Supported Payload: 11.0 lbs (5 kg)

Base Mount Interface: 3/8″-16 Female Thread

Tilting Freedom: Full 90° Upward / 90° Downward Pivot

Panning Freedom: 360° Independent Rotation