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Message: <blockquote data-quote="pshute" data-source="post: 1630851" data-attributes="member: 59235">Thanks for offering that, very kind of you.  I have instead decided to try a 400mm lens, the equivalent of adding a 1.33 teleconverter, except there will be no light loss.I have a Sigma APO 400mm f5.6 on the way in the post, and also today stumbled on a Tokina made OM Vivitar 400mm f5.6 locally for $50.  I tried it in the shop using their $200 Olympus adapter, and can see an improvement over the 300mm, but won't be able to try it properly until the $20 eBay adapter arrives.I'll try them both and sell the one that I decide not to use.  Even if the improvement is slight, they both focus to 4m, 2m closer than my current lens, so that will be handy.</blockquote>