- Purpose: A tripod mount ring that fixes and balances heavy or long tele lenses that tend to hang forward from the camera body, improving stability and steadiness in shots. - Arca-Swiss compatibility: Includes an Arca-Swiss bottom plate to attach the lens to a Ball Head, Clamp, or Panorama Head that uses the Arca-Swiss standard. - Bottom mounting options: The base features threaded holes for 3/8 inch-16 and 1/4 inch-20 bolts, enabling attachment to tripods, light stands, and other supports. - Construction and size: Made of aluminum alloy. Ring diameter is 80 mm (3.1 in). Weight is 188 g (0.41 lb). - Quick release plate feature: The tripod collar bottom adds a 50 mm long Arca-fit quick release plate, compatible with Arca-Swiss 39 mm fit tripod ball heads, panoramic heads, and clamps directly. This QR-Plate design is more practical than lens collars without a QR plate. - Benefits and practicality: - Enhances balance for heavy or long tele lenses, reducing front-end sag and camera shake. - Simplifies mounting to Arca-Swiss heads and supports quick transitions between setups. - Flexible mounting on tripods or stands using standard 3/8-16 and 1/4-20 threads. - Use scenarios: - Wildlife or bird photography with a long tele lens mounted on an Arca-Swiss head for stable, balanced shots. - Sports photography on a tripod setup where quick head changes and reliable QR mounting are advantageous. - Field shoots on a light stand or tripod where an integrated QR plate allows direct attachment to compatible Arca-Swiss heads, clamps, or panoramas without additional adapters.