Not an everyday news. If you have a medical device, i.e. a pacemaker, you should not use this lens, Nikon says. The culprit is a technology named Silky Swift Voice Coil Motor (SSVCM).
The Nikkor Z 400mm f/2.8 TC VR S, a lens that sells for almost $14,000, might affect a pacemaker and hence put your health in danger. The user manual for the lens (download here) contains the following warning:
Do not use this product if you have a pacemaker or other medical device. The magnet or magnets in this product could cause medical devices to malfunction.
As PetaPixel explains:
The reason for the warning is the newly-unveiled autofocus drive system in the lens that Nikon has named Silky Swift Voice Coil Motor (SSVCM).
SSVCM uses magnets instead of gears to move the lens focus groups forward and backward within the lens body. It’s a new AF system that, compared to Nikon’s older systems, boasts higher initial speed, higher accuracy, and the smoothest and quietest operation of any Nikon autofocus drive system released thus far.
The magnets, however, are so powerful that they could interfere with pacemakers and other medical devices, which could potentially be fatal to the person the device is implanted in or used by. The risk is apparently so great that Nikon is not taking any chances, warning anyone with any medical device to simply not use lenses with this autofocus system (which is currently just the 400mm f/2.8 TC VR S lens)
Curious about the Nikkor Z 400mm f/2.8 TC VR S? Have a look at the short video below.
More about the lens after the break.