Canon zoom teardown: LensRentals takes apart new Canon EF 70-300mm f/4-5.6 IS II lens
posted Thursday, February 2, 2017 at 12:00 PM EDT
An aspect of the new 70-300mm lens which makes it interesting is its Nano USM focusing motor. The Nano Ultrasonic Motor technology debuted in the latest version of the EF-S 18-135mm f/3.5-5.6 IS lens which launched alongside the Canon 80D camera. Nano USM technology is designed to help bridge the gap between still and video autofocusing. The "Nano" part of its name is due to the new direct-drive system's compact size.
As is regularly the case with modern lenses, Canon has packed a shocking number of components inside the lens barrel. It being a zoom lens makes it even more demanding to the engineers who are tasked with figuring out how to make everything as compact and cost-effective as possible.
While it looks complicated, LensRentals remarks "We love working on most of the newer Canon lenses because of the modular construction and the Canon 70-300mm f/4-5.6 IS II is no different. The entire outer barrel with focus and zoom rings, as well as most of the electronics, comes off as a single piece."
To see many more images and learn more about the internals of the 70-300mm zoom lens, head over to the LensRentals blog post.
(Seen via Canon Watch)