EXCERPT page containing first few paragraphs. 2021-12-02 20:28:02
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Flare control is outstanding with the 17/4L, even forgetting its extreme angle of view.However, shading the bulbous front element from grazing sunlight can eliminate small ghosting flares.
Veiling flare is all but absent, but shading the front lens element from non-image-forming light is always a good idea (use a hand or similar along with Live View to avoid including the hand!).
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While noticeable flare spots can be forced under extreme lighting, this example is a good representation of what can be expected: some minor “ghosts” and some rainbow-color flare.
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