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Say the Bees head 3mm wide
and sensor width is 24mm (35x24mm)
24/3 = 8
and because the bees head is only taking up half the width of the frame
8/2= 4
probably around 4-5x magnification
could "easily" be done with a reverse 28mm lens and extension tubes but probably of taken alot of practice shots. Is there any exif data?