Thankyou SO MUCH Maddog, for taking the time to help us both out. Answers I have spent hours searching for are finally becoming clear. Im not sure that I would need or even want all of these wet mount options. But its good to understand what the options might be before I spend the cash.
I just noticed also that with Ikelites new housing for the G11, they are advertising a new adaptor that you can slide on for mounting 67mm macro lenses.
So if there is a 67mm adaptor for the long/macro port on the Patima, Im still wondering if a 67mm Fantasea Bigeye Dome would work on the long/macro port. If so, then you should be able to zoom wider - (like with the Ilkelite dome). And if you carried it with you on a WA dive with the short port, you would have 3 possible focal lengths, even if you cant zoom: 1) No wetmount lens 2) Bigeye and 3) New lens from Reef . Ill write to Fantasea to find out if this has been done - and Ill post their response here.
Another good option for a macro lens might be the Reefnet Subsee adaptor. You can flip it in and out, rather than detaching it - which might be really convenient. And I think they have started making them for attaching 67mm Wet Mount lenses. Ill write to Reefnet and see if they can make one for the long port of the Patima housing - and Ill post their response here.
In terms of macro work, it might depend on whether you want to photograph still subjects like nudibranchs and slugs - versus small, timid, moving fish. With a still subject, I would have thought you could get as close as you want with a wide-angle setting and take a good picture. My experience is with bird photography, where it doesnt matter how much you spend on longer and more expensive telephoto lenses, you never seem to get close enough before the subject takes off. And now I think I might be interested in small and timid fish! So Im pretty sure that I will want to be able to use the longer end of the zoom.
But what Id really love to know now is whether the 140mm on the G10/G11 versus the 105mm on the S90 will make any practical difference in the real world underwater - with or without a macro wet mount lens.
Rob