Sea frogs

Sea Frogs extension adapter ring V.1

€59.00 €95.00

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We do not apply VAT or any additional charges for countries outside the EU.


Compatible lenses & ports list 

Extension ring V.1 for SeaFrogs 6' and 8' Dome Ports.

This is the shortest extension adapter ring available, measuring 23mm in length.

The extension ring can be used with all SeaFrogs dome ports to get the correct distance from the lens to the focus point.

Compatible with Sea Frogs camera housings listed above.


Please note that when you use the Extension ring for Dome Port V.1 with some modifications of the A7S III / A7 IV / A7R IV / A1 camera housings, the aperture control wheel does not function properly.


  • Port Opening Diameter: 89 mm
  • Length (including bayonet): 40 mm
  • Extension length: 23 mm


  • Polycarbonate base

Package includes:

  • Extension ring V.1
  • Spare O-ring 
  • 5ml Silicone oil tube

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