Number of diaphragm blades 11 (Rounded diaphragm)

It features an anti-resonance 30 mm thick MDF (medium density fiberboard) plinth

with the 50-400mm F4

During Playback

Vivitar GoPro Action Pro Series All-in-One Helmet Kit Brand_Fujifilm Number of diaphragm blades 11Product Description The Vivitar Action Pro Series Helmet Kit is a comprehensive set of mounts, including a curved helmet mount, a flat surface mount, and a vented helmet mount, all compatible with GoPro cameras and most other action cameras. Product Features Compatible with GoPro Cameras Works with Most Other Action Cameras Curved Helmet Mount Flat Surface Mount Vented Helmet Mount Product Specifications Brand: Vivitar Color: Silver Compatible