darinwc, as my previous post, do you have a specific subject in mind or are you looking simply to extend your range of gear in the hope of some diversity? It's an important decision. I bought my 200/ f4 to photograph animals in a local zoo, busy place, not much room or time to set up a tripod, hence the f4. OTOH, I bought the 300 f4.5 on a whim. I was passing a photo. shop and I saw it in the window at a good price and went for it. I've since managed to find a 1.4 Olympus matched TC, making it a 420mm., I would not attempt to use that combo. handheld. I am not a fan of zoom lenses but I do have one, only one, amongst my collection of 9/10 Zuikos, the 50 - 250mm. Zuiko f5. I bought it as a 'grab it and go' to use on one of my OM bodies. Most importantly, you must decide why you need it,.