Canon calls this the EF-S 17-55mm f/2.8 IS USM. EF: Electronic Focus. All modern Canon lenses do this. -S: Only works on newer, small (1.6x factor) DSLRs, which are the Rebels, 30D and 20D. IS: Image Stabilization. See Why IS Matters. USM: Ultra-Sonic Motor: The focus motor operates silently. Focal Length. 17-55mm. Canon PowerShot S100 Canon EOS 6D Canon EF 70-300mm f/4.5-5.6 DO IS USM Canon EF 100mm F2.8L Macro IS USM Canon EF 70-200mm F4L IS USM +12 more Reply Reply with quote Reply to thread Complain Verdict. Specification. This wide angle prime lens from Canon sports a fast maximum aperture of f/2, an ultrasonic focus motor and image stabilisation. This lens is currently available for around The image quality of the EF 70-200 f/2.8L IS II with the teleconverter is somewhere between the old EF 100-400 L IS and the new EF 100-400 L IS II. Which is stlll very good. So you can make the EF 70-200 f/2.8L IS II longer, there is nothing you can do to the EF 100-400 L IS II, to give you a wide f/2.8 aperture. Canon EOS 6D Canon EOS R10 Canon EF 50mm F1.8 II Canon EF 100mm f/2.0 USM Canon EF 17-40mm f/4.0L USM +1 more Reply Reply with quote Reply to thread Complain Canon EOS 5D Mark II Canon EOS 80D Canon EF 28mm f/1.8 USM Canon EF 35mm F2.0 Canon EF 100mm f/2.0 USM +5 more Reply Reply with quote Reply to thread Complain It takes heritage from the Canon EF 100mm f/2.8L Macro IS USM but builds on it enormously for the RF range, compatible with the R5 body. Up to eight stops of hybrid image stabilization steadies the frame while a bright f/2.8 aperture lets light soak into the image sensor. Review manufacturer specifications and detailed lab measurements for the Canon EF 100-400mm f/4.5-5.6L IS USM Lens. Compare the specs and measurements of this lens with other lenses. The device is protected with extra seals to prevent failures caused by dust, raindrops, and water splashes. Has a metal mount. Canon EF 100mm F/2 USM. Canon RF 24-240mm f/4-6.3 IS USM. A metal mount is generally superior to a plastic mount as it is more durable. weight. This includes the newest pair to join the growing stable of great glass – the RF Canon RF 100-400mm f/5.6-8 IS USM zoom and the wide-angle RF RF 16mm f/2.8 STM. xOWpuS.