A macro lens is defined as one having 1x magnification, meaning 1cm in real life at the focus plane is mapped to 1cm on the image sensor. A full frame sensor is 3.6cm across horizontally, so a 3.6cm object fills a photo. These things are smaller, so they need a super macro lens with 2x or even 5x magnification. You can get that by buying such a lens, using macro bellows, clipping a separate magnifying lens in front of your normal macro lens, etc.
In any case, with such a high magnification, the plane of focus becomes very narrow, so they're very likely also doing focus stacking.
And you need a lot of light, so they're probably also using a flash.
In any case, with such a high magnification, the plane of focus becomes very narrow, so they're very likely also doing focus stacking.
And you need a lot of light, so they're probably also using a flash.