Subal ND20 Housing - Bayonet Type 3 or 4 ??

Hello, 

After 12 years, I am getting back into UW Photography, I have just picked up a Subal ND20 Rig/Ports and other items.

Just waiting to be delivered.

I need to get an extension ring, but was wondering if the Bayonet Type is 3 or 4 ??

I would have thought its a Type 3 as its an older housing, but double checking.

Keep safe

Regards

Brian UK  

I had Subal ND2 and originally comes as type 3 and I believe, it is impossible to fit type 4 in it, even if you want as the opening and internals would not allow the conversion. However, I have Subal ND7100 and another one for Nikon D90, both type 4, so I can measure the diameter of the porthole and let you know.

Take a look at this explanation: SUBAL PORT MOUNT IDENTIFICATION

Thanks for this !

Sorry I meant ND20 Housing

I have just measured the porthole of my type 4 housing and the diameter is 110 mm, so yours should be 100 mm. 

Thanks