The optical formula of the Canon EF 24-70mm f/4L IS USM integrates two aspherical and two UD glass lenses as well as an ultra-low dispersion lens, and benefits from a Super Spectra coating to ensure optimal contrast by fighting against glare and ghosting.As an L series lens, the Canon EF 24-70mm f/4L IS USM’s optical formula is particularly well thought-out. Although many observers expected simply a stabilized version of the 24-70mm f/2.8, this stabilized 24-70mm sees the light of day at f/4. This more modest aperture will be less likely to generate a blurry background than if
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