I'll be spending two months in Alaska this summer. I normally carry a Canon DSLR, 70-200 2.8 L, 24-105 L and 17-40 L. A very heavy and cumbersome kit. I'd really like to lighten up. I have a EP-5, Oly 45 1.8, Oly 17 2.8, Pany 20 1.7 and a totally worthless Oly 40-150 R 4.0-5.6. So....I'm thinking about adding a Oly 40-150 2.8 PRO to the mix. I'm wondering if anyone here has experience with the 40-150 2.8 PRO mated to a PEN. Is it an ergonomics disaster or is it a brilliant combination?