@ B3Guy "I just balance mine between hard stops".. Yes, I am doing the exact same with this lense! It gets sharp without loosing too much light. If balance alone is to insecure for you you could add a lens band to keep it in place: http://lensband.com/store/ (actually any kind of rubber band with the right dimensions will do as well...)
@stonebat I doubt you will be happy with such a converter, from what I have seen 0.6x adds alot CA and distortion. If you could prove the opposite you could make me happy anyhow. :=)
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