Thanks Carroll
Yup all macro is like this, especially true macro which start at ratios of 1:1 and closer. Some lenses have ' close focus ' marked on them or the word ' macro ' but these can just sometimes be marketing BS to sucker the consumer. Tamron 90mm that used was marketed as a Macro, although strictly speaking, its not true macro but its damn close at 1:2, which means only a 50mm extension tube is needed to achieve 1:1 ( or a 2x TC ) and Tamron built one just for that lens
The best way to get DOF is to use focus stacking, but this doesnt work if your bug is moving