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Mike, your lens is way too tiny. The lens is almost as large as the iris, and the iris floats over it like a ring shaped island. It is slightly convex.

Yeah, I changed that for the above renders, not like it makes much of a difference anyway. I was just kind of winging it at the time, not really following anything but memory of pictures I had looked at.

If I set out to model something more accurate, I'll see that it gets done up right. ;-)