Alex; Like that hand held idea a lot but apart from blind, you need to be more bold than blind to go for that. My "Arachnophobia" won't let me doing that. But for macro there is no other way easier to focus than having subject hand held, provided the holder is not having Parkinson's either
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These macros are getting more and more interesting. Thanks for sharing the reverse 50mm idea and throwing a headlight in macro section of the forum.