What is the latest shooting distance of 5d2 with 24-70 lens?

My camera is 5D2, 24-70 cameras. Recently, the theoretical shooting distance of this head is 38cm, but I shot the trinket "2 cubic centimeters" at about 20cm, and the film production effect is acceptable, which is suitable for general commercial use. This lens is a zoom lens designed around the 50mm standard fixed-focus lens, which is mainly used for portrait shooting and can also take into account the scenery. It's a little inappropriate to shoot macro with it.

For commercial photography, it is recommended to consider the latest professional macro lens, with the closest focusing distance of 30cm (50mm fixed-focus lens without aperture 2.8, only 1.2L, 1.4, 1.8, 2.5). I hope it helps you.