Most dedicated macro lenses have a 1:1 maximum reproduction ratio, which means they can project an image of the subject on your camera's sensor up to the same size it is in real life. However, the Venus Optics Laowa 25mm f/2.8 2.5-5X Ultra Macro can project an image of your subject up to five times bigger than it is in real life, opening up an entirely new world of extreme macro photography. This great video review takes a look at the lens and the sort of performance and image quality you can expect from it in practice.