Unfortunately for Nikon lens enthusiasts who adapt them for use on other camera brands, the Tamron SP 85mm f1.8 VC is compatible only with modern Nikon cameras. That's because it has an E-type electromagnetic aperture which will not work with Nikon G-type mechanical adapters. A very regrettable move on Tamron's part! So far, this appears to be the only Nikon E-type lens compatible with Tamron's Tap-in Console. The rest are all G-type lenses. The E-type lenses released by Nikon have manual aperture rings to enable operation on legacy Nikon cameras that lack support for their electromagnetic apertures. With this lens, Tamron goes a step farther, producing a Nikon-mount lens whose aperture cannot be manually controlled.