With 13 elements in 10 groups, we might expect some flare problems, but Canon SWC (sub wavelength coating) apparently saves the day.
Into the sun
Flare control into the sun is excellent. Veiling flare is very well controlled, and ghosting flare is diffuse and not too noticeable.
I tried hard to “force” a flare problem by positioning the sun in various areas of the frame, and did not find a way to do so: flare control is excellent.
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Since 2006, Diglloyd Advanced Photography is the authoritative review and reference for DSLRs and their lenses: Canon and Nikon primarily, but also Pentax and some medium format. Reviews of key DSLRs are included, but the primary focus is on lens performance. Also included is a wealth of technique and workflow approaches.
DAP includes thousands of pages of exclusive coverage and high resolution Retina-grade examples detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare, behavioral and practical usage.