One more question

I have a 105VR port on the way, but it probably won't get in the water until I'm away. Is there anything I should be prepared with or need to get to make it work on the ND20? The focus system of the port works straight on the lens - so I don't need a gear?? ... but anything else?
cheers
Leander
Nope, the port works great for the 105vr lens and the focus knob is smooth, full-time manual focus - on-demand so to speak - is a neat thing!!
Only thing is if you want to use a Woody's diopter with it in the future email him and ask him to make you one in a 120mm size (unusual size to fit 105vr port). Or maybe a dealer will decide to make some in that size by then.
If you want to add a screw on diopter inside the port it won't fit (I learned all about this). You need to either remove (or get someone to remove) the black ring around the diopter and place the glass on the front of the 105vr lens with blue sticky tack stuff or you can add an extension ring - but then you need to get the extension ring "bored out" to accommodate the "fat" lens and still the manual focus knob will not line up. Better to place glass diopter on front of the lens with blu tak, probably so it will fit in port. I'm in the process of sending my 5T and 6T diopters to Ryan Canon right now for him to remove the diopters for me because I can't remove the black rings........of course he makes it look so easy!! Those camera whizes!!!!
B)
Do you want to shoot with teleconverters? The Kenko 2X and 1.4X will work with the Subal 105vr port and extension rings and the manual focus knob will still work. I think the 1.4X works with the 20mm ex ring (bored out for the fat lens) and you can still use the manual focus knob. And the 2X works with a combo of the 15mm ex ring and the 30mm ex ring (as I recall), I used it and the manual knob still engages.
Or you can add a Macro Mate from Backscatter to the front of the 105vr, but that wet double diopter is really heavy and on an already heavy lens?........, egads.....
Chuck is right the new ULCS "fat" buoyancy arms will help a lot, but I hear you have to get 10" to 12" ones to really make a difference, 8" ones don't do that much. I like the 8" arms that I have, thus my other solutions.
Wide angle is not as heavy as the macro setups, especially the 105vr.
Leander that should about cover it!!!!! Most all forseeable configurations!!!
Best to you, Carol 