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Well, because simply I dont have any.
It takes time, patience, lots of trying (trial). Sometimes I get one good (satisfaction) shot out of 100.
Today I was doing some experiments with my old Russian wide lens MIR-1B (37mm/F2.8) along with the 98mm long extension tube. Magnification came great , something like 4:1 or more. But....the object got to be so close to the lens.... almost touching the front glass...or 2-3 mm away from it. Would be impossible to use flash in such situations.

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