Lens model identification, just like a lens identification system, the same focus segment of the same aperture lens can only be distinguished by the lens identification. Just as AF-S VR 70-200mm F2.8G IF ED IS Nikon's "small bamboo gun" and EF70-200mm F2.8L IS USM is Canon's "love little white", AF-S, VR, G belong to Nikon's lens logo and EF, L, IS, USM belong to Canon's lens unique logo. So by looking at the lens logo alone, you can distinguish which lens from which manufacturer.