Hi Mike, thanks for the edit, it looks good, I will go back and investigate it.
Regarding EM1, I think its great, I used to have a D7000 but got fed up with the travelling with it and changed to this as it was smaller and I couldn't see any difference in quality, ok the tracking system is not as good, but I just believe that this technology is going to improve and I can develop with it. I'm not an expert but with a fisheye it works very well, in clear waters (Egypt) it focuses very fast, not so much with the macro, this hunts a bit without a focus light.
This setup coped fine with the blue sharks, they arent that fast moving really, so it was fine. I dived with sealions last year and did struggle a bit as they are fast, but it was the first time using the camera, so I think I would cope better now.
Where abouts are you based Mike, you are more than welcome to have a look at mine and see what you think, it may even be for sale soon as well