Exclusive tele converter offering 1.4x magnification that has been designed to match the optics of the SP 150-600mm G2, providing a maximum zoom range up to 840mm.

Available focusing mode when used with SP 150-600mm F/5-6.3 Di VC USD G2

*1 Autofocus functions normally on any camera that offers F/8 autofocusing (see your camera’s instruction manual for your camera’s ability).
*2 Subjects with low contrast and/or luminosity values can sometimes result in out-of-focus images.

In the end it depends on the visible contrast for the AF-metering system in the camera. Simply saying on camera, subject, and lighting conditions.