I took a picture of daisy pollen on the tip of a 25G needle
I do extreme macro photography. I took a new 25G medical needle, the type that is used to for vaccines, insulin or to inject local anaesthetic into the skin. It is a very fine needle, the opening is less than 1mm long.
I dipped it into the centre of a daisy to pick up some pollen.
This sort of picture is done with a microscope lens attached to a standard camera. Taking a single photo has an extremely shallow depth of field, meaning that only a tiny sliver is in focus. To get the entire needle in focus, we take a series of photos, moving the camera on a rail by a few microns each time. We then assemble all the pictures using stacking software that pics the best-focussed bits of each photo and makes a single well-focussed picture.