Hello, I have a zuiko 70-300 for my 4/3 camera but I am changing to m4/3 (EPL-2, probably). On the one hand I wanted to have a more lightweight system but on the other hand it is important for me to increase focal lenghs. I wanted to get over 800 mm (equiv). First I thought about buying the Zuiko EC-20 to use with my Zuiko 70-300 and an adapter for m4/3, but the prices are really high. As I normally use manual focus I thought that maybe I could go for a good manual lens. I have found the tokina 100-300 but it weighs about 1,5 kg. Are there other good zoom lenses a little less weighted? I was planning to use it with a teleconverter 1,4 or 2,0x. Any suggestions? I want them for nature photography. Any advises? I am open to any other lenses that would work fine. Thank you very much.