Noboru Sonehara at the Japanese Kakaku.com Magazine has been putting Nikon's NIKKOR Z 100-400mm f/4.5-5.6 VR S lens through its paces while pairing it with Nikon's 1.4x and 2x Z-mount teleconverters.

As a 1.4x teleconverter, the focal length of the attached lens is magnified by a factor of 1.4x, with a 1 f/stop reduction in aperture rating, so a 70-200mm f/2.8 zoom effectively becomes roughly a ...