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I will start this by saying I am not sure yet I will enter, but, perhaps to keep everyone honest, the submission should be full frame only, no cropping.
That is the only way to ensure that there is a good ability to judge the image is 1/3 life size on the sensor, or larger.
People also need to recognize just because they use a macro lens, it does not automatically qualify as a macro shot. Most macro lenses, if they specify magnification ratio, specify the maximum magnification at minimum focus distance.
This (the 1:3 ratio) might be a somewhat difficult rule to enforce in practical terms
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