I would suggest you look at the ZEN WA-100. It is only $375 now and I can attest that it is nicely made. I've used it for a while with both the epl2 & now epl7.
I could not find the specs on the dimensions of the WA-100, but I suspect it and the AOI are within millimeters of each other.
I say that because even though you might be able to fit all those lens into the AOI, I don't think all of them will work very well underwater.
Zen lists the lens that the port is designed for, which is the kit 14-42 & 9-18. I and others have successfully used the 60mm in that dome also.
I have been happy with my AOI for the 8mm.
So, I think both ZEN and AOI make good products.
My point is don't base your decision on the list of AOI supported lens, because I just don't think it's reality.
- 50fathom likes this