Macro photography with reversed lensesWritten by Paul Bourke
100mm macro coupled to a 50mm prime lens, lens front to lens front.
Pencil mark on plaster wall (click for original image).
Australian $2 coin (click for original image).
Of course depth of field is very compact, following example using focus stacking.
Garden grub, ~1cm across sensor, 11 photographs
Baby slater, 1/2cm across sensor, 10 photographs
Flower, ~1cm across sensor, 12 photographs
Dragonfly eating a caterpillar