If you don´t own a macro lens a retro adapter is a cheap way to experiment with macro photography and achieve a great zoom factor. Old manual lenses are ideal because you need to set everything manually and small focal lenses will provide a higher reproduction scale, but this will also lead to a longer exposure time and the depth of field will decrease. I realized this one with my canon 24-70 mm 2.8l, retro adapter and some focus stacking.
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From @vizista