I have a Nikon D5100 with the AF-S Micro Nikkor 105mm 1:2.8G IF ED lens. I would like to get closer to subjects and favour the Teleconverter route over the Extension Tube route. Choices are the Nikon TC 1.7E II or TC 2.0E II or the Kenko DGX Series 1.4x, 2.0x, 3.0x. Nikon reports issues with autofoc...