What is underwater housing for?
The waterproof housing case is essentially a camera case for your Digital camera, but one that allows full control of the camera when diving, is waterproof and pressure-proof, so the case is designed for Sepecfic camera& Lens models, you should check the compatible list before purchasing.

Matched Camera: for Sony FX3, (ILME-FX3) Only, not apply to other Camera

Compatible lenses/ With Standard Flat Port:

• Sony FE 28-70mm F3.5-5.6 (Zoom gear included)
• Sony FE 50mm f/1.2 GM (Auto Focus only)
• Sony FE 35mm f/1.4 GM (Auto Focus only)
• Sony FE 85mm f/1.8 (Auto Focus only)
• Sony FE 24mm f/1.4 GM (Auto Focus only)
• Sony FE 14mm f/1.8 GM (Auto Focus only)
• Sony FE 24-70mm f/4 (Auto Focus only)
• Sony FE 16-35mm f/4 (Auto Focus only)
• Tamron 17-28mm f/2.8 for Sony E-Mount (Auto Focus only)
• Sigma 16mm f/1.4 DC for Sony E-Mount (Auto Focus only)
• Sigma 28-70mm f/2.8 for Sony E-Mount (Auto Focus only)

Materials : Polycarbonate/ ABS plastic/ Stainless steel/ EPDM rubber/ O'ring sealed buttons with spring

Other features:

• Sync cable port
• High-quality optical viewfinder
• Inbuilt leak detection sensor
• Fiber optic port
• Stainless steel mounting plate 1/4" Thread
• Reinforced metallic bottom plate
• Multi-coated optical glass lens port

Package list:

• 1x Underwater housing for Sony FX3 Black
• 1x Zoom gear/ for Sony 28-70mm F3.5-5.6 lens
• 1xUser manual
• 1xSpare O'ring
• 1x Shoulder & wrist strap
• ​1x Dust-free cloth