The SeaFrogs 4" Optical Glass Flat Port is specifically designed for use with the lens Sigma 18-50mm F2.8 DC DN with the ability to utilize the entire zoom range without limitations. It is compatible with Seafrogs UW housings for Sony A6600/A6700/FX30 40M/130FT. 

Suitable only for:

• SeaFrogs Underwater camera housing for Sony FX30 - purchase here
• SeaFrogs Underwater camera housing for Sony A6600 - purchase here
• SeaFrogs Underwater camera housing for Sony A6700 - purchase here

Compatible lenses:

• Sigma 18-50mm F2.8 DC DN (Autofocus only, manual zoom gear included)

Materials

• Polycarbonate
• Optical glass

Package Includes

• Flat Port
• Zoom gear for Sigma 18-50mm F2.8 DC DN
• Silicone grease (5ml)
• Spare O-ring