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This is the setup used on my EM-1 with the Raynox MSN 25 diopter supplementary on the 4/3 50mm f2 for extreme macro. It is shown with maximum extension of the lens to closest working distance, which normally gives FOV 35mm wide on m4/3. The x2 matched TC makes that 17.5mm and the Raynox makes that 5mm at a working distance of about 20mm.
Using a x1.4 TC gives FOV ca 7mm and withough a TC FOV is 10mm. The working distance at a given magnification is the same without TC or with either.
The components, from left to right:
Olympus 4/3 adapter MMF-2*, Olympus Digital 4/3 2x Teleconverter EC-20, Olympus Digital 4/3 50mm f2 1:2 macro, adapter to attach MSN (37mm thread), Raynox MSN-202 macro converter (37mm rear thread).
My recent macro shots in Macro World were taken with versions of this setup.
I have not shown the camera or flash as the flash units, up to three, are all off camera, and this setup would also work with flash on the hot shoe (not my choice except when unavoidable).
ï¿½ Harold Gough 2016