The Wimberley AP-640 Replacement Foot is designed for the Sony FE 400-800mm f/6.3-8 G OSS lens, replacing the original tripod collar foot with an Arca-type compatible quick-release plate. It enables direct mounting to Arca-Swiss style clamps while improving the rigidity of the lens support system.

Its optimized geometry enhances balance when used with gimbal heads such as the Wimberley Sidekick or Sidemount Head. The anodized aluminum and stainless steel construction reduces flex and vibration, while an integrated QD socket supports sling attachment for wildlife and telephoto photography setups.