John Gulliver
Contributor
I use an Inon S2000 bought used, and after looking through my wifes shots(she onlys have the kit lens), I think she need a strobe too. It takes out the full potential of this camera/lens combination, but she also have some very good shots without the strobe.
It all depends on the light available.... By the way, I also shot a video of the frogfish moving, and the quality is far better than my Gopro.....
In my opinion, you definitley need a strobe, preferably two. Sea & Sea's YS-01 with a fibre-optic cable works fine with the E-PM1. I've also found that you need a decent video light to take good video under water.