confused about Subal bayonet mounts

Hi

Originally i had an ND20 and bought a DP-FE2 dome. A few years ago I upgraded to an ND300S housing and my dome still fits. This implies you can mount a MK2 dome on a Mk3 housing (I assume the ND300S is Mk3?)

I am now thinking of upgrading again to a ND500 which comes either Mk3 or 4 . However I have been told that my DP-FE2 will not fit this housing which seem odd as surely it will fit on the Mk3 version. Or is there something else about the housing that means it wont fit?

Can anyone tell me how you tell the different between a Mk2 and Mk3 port as have found someone selling what they believe is a DPFE Mk3, but they aren't sure.

Thanks

Mike

Go to Reef Photo Knowledge site. They had an explanation of the difference.

Subal housing have an adapterring mounted in the housing that determines the version. It can be changed out.

unfortunately that only explains the difference between Mk3 and 4 not Mk2

Masplin,

If you measure your port opening, your Mk2 should be a type 3

Elmer