So my Little Tuna arrived, but have only really had a chance to take it out to a local subdivision pond in search of baby ducks. Managed to get two decent shots of an Egyptian Goose, no good baby ducks photos tho. While it is a bit shorter then my 50-200 SWD it is about 50% heavier. It seems to be heavier then it actually is because it is so small and fat, a lot of weight in a small area. That said, it is easy to handhold and I don't really see the weight being that much of a problem (maybe after a long day of shooting I will start to feel the additional weight). It also seems to focus a little faster then my 50-200 SWD, but that could be in my head......need to take both out and test them together. The lens seems to be close to perfect on focus, maybe a little front focus. With the EC-20 (have not tried with the EC-14 yet) it is a bit off and I have it set to +13 at the moment. Waiting for my focus tune target to come in so I can test the 150 and the SWD without and with both EC's. Both photos taken with EM1, handheld, and wide open at ƒ2.0. The first one really shows how shallow the DOF is at ƒ2.0. Can't wait to get this out in the woods and see how it performs as my main wildlife lens.