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Message: <blockquote data-quote="Jim M." data-source="post: 3480801" data-attributes="member: 60675"><p>Both the panasonic 100-400 and the Olympus 300mm f4 have in-lens stabilization that works in tandem with stabilization of the newer bodies of their respective brands to provide even better stabilization.  So if you go with one of those lenses having a body from the same manufacturer is an advantage.  I have both those lenses and don't find either too heavy to carry for long periods with a shoulder strap--though the panasonic is noticeably lighter and occasionally I need to switch shoulders with the Olympus because of slight muscle fatigue.  The extra reach (requires the teleconverter for the Olympus) is defintely helpful for bird photography vs. the 300mm zooms.  And both are better optically at the long end.</p></blockquote><p></p>