Why do you need a Brightin Star 9mm F5.6 ultra-wide-angle lens?

Brightin Star 9mm F5.6 has the the best focal length of the ultra-wide angle lens?
More detalis please refer to the video.
Key Features:
✅ Aperture:F5.6-F22
✅ Size: Filter Diameter 64mm/Focal Length 9mm/ N.W 0.43kg
✅ Compatible Mountings:Canon-RF/Nikon-Z/Sony-E/L mount
✅ Equipped with Rear Lens ND Filter for Better Shots.It can make lakes like brocade,running water like silk,waterfalls like silk,clouds like cotton,and crowds eliminate.
✅ Price:$479.99 USD
Get the lens here:
Amazin--reurl.cc/ZyLyMp
Direct--reurl.cc/q0W0o0
AliExpress--reurl.cc/80pj1g
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[@user-hr3lj2zw9p]

Good lens...