Help with Sea@Sea ports

Hi,

I'm thinking of buying a Sea&Sea DX-5D housing and I've seen the ports that I need in the Sea&Sea web:

- for the Sigma 15 mm and the Canon 17-40L the port is the NX Fisheye Dome Port (56401)

- for the Canon 100mm f2.8 macro USM, there are two options: NX Custom Flat Port or DX Macro Port 50 with DX Macro Port Base

I don't like those ports for the 100mm because are very big and no possibility to use wet close lense like woody's diopter.

Somebody have tried the following option?:

NX Compact Macro Port Base ( 56201)" and "Compact Macro Port 52 (56241)"

Are there another flat ports for de 100mm in DX-5D housing?

Thanks.

You may want to consider this port from Athena, it allows for a 67 mm close-up lens like the Inon M-67 and the Athena ring flash. athena-opt.com

Regards

Phil Rudin