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 Review manufacturer specifications and detailed lab measurements for the Canon EF 100-400mm f/4.5-5.6L IS II USM Lens. Compare the specs and measurements of this lens with other lenses. Canon EOS R3, Canon EOS R5, Canon 5D Mark IV, Canon 7D, Canon EF 14mm f2.8L USM, Canon EF 17-40mm f/4L USM, Canon TS-E 24mm f/3.5L, Canon EF 24-105mm f/4L IS II USM, Canon EF 135mm f/2L USM, Canon EF 180mm f/3.5L Macro USM, Canon EF 100-400mm f/4.5-5.6L IS USM, Canon EF 600mm f/4L IS USM, Canon EF 50mm f/1.4 USM, Canon EF 100mm f/2.8 USM Macro Lens, Canon RF100-500mm F4.5-7.1 L IS USM, Canon Canon EF 70-200mm f/4L IS USM Lens Review. By: What Digital Camera (Feb 20, 2013) Overall, the f/4 lens clearly plays second fiddle on paper but it is a very easy lens to carry and to use. Though it is expensive it is only roughly half that of the f/2.8 version, based on Canons SRPs. So there's probably a case for saying Canon has made the f/4 The Canon EF 17-40mm F4.0L USM has been on the market for many years now, but remains popular with Canon photographers using both full-frame and APS-C DSLRs (on which it covers an equivalent focal length range of 27-64mm). An extremely tough and compact lens, the 17-40mm does not get any larger when zooming or focusing, and the inclusion of Canon calls this the CANON ZOOM LENS EF 70-300mm f/4-5.6 L IS USM. EF means "electronic focus," meaning that there is an autofocus motor in the lens itself. All Canon lenses since 1987 have been EF. L means as expensive as L. IS means Image Stabilization. USM means Ultra-Sonic Motor, meaning AF is almost silent. Optics top. 19 elements in 14 If you have a 50mm lens on a full frame, I think the more logical portrait prime to supplement the 50mm is the 100mm over the Canon 85mm F/1.8. As both lenses offer identical build quality of the 100mm F/2 and the added reach of the 100mm over the 85mm is a small but added bonus. B&H Photo for $1,999.00. (From Canon lens literature) Retaining the impressive optical performance and large aperture of the original EF 85mm f/1.2L USM, this new medium telephoto lens uses a Ring cfmq0.