The Olympus 12–45 mm features 9 groups of elements. It means 18 air-to-glass surfaces. Perhaps the number is not exceedingly high, because zoom lenses happen to have even twice as much of them, but still the tested lens didn't have it easy in this category. What's more, its small, compact barrel doesn't have plenty of room for additional elements which might damp down unwanted light and flares.
As a result the tested lens experiences a lot of problems with the performance against bright light. Flares can appear no matter what focal length you employ and in many different position of sources of light. The situation is perhaps not abyssmal but there is nothing to praise the tested lens for either.
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