for the sigma 150 - something I would like to have ausemmao said:Have the 105 macro, it's a great lens. One rarely mentioned benefit of it is that it's compatible with the TCxx-E teleconverters, and they do not change MFD. So you get a 1.4x 140mm f4, 1.7x 170mm f4.8, or a 2x 210mm f5.6 macro as well.