Lens hood - do you use one?

Started Feb 18, 2013 | Discussions thread
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Petal shape answer.
In reply to sensible, Feb 18, 2013

The petal shape is an optimized shape that allows superior shading for the lens. The corners of the rectangular camera format fit in the "cut" sections of the petal, while the long sections shade the sides. The petal shape is most often used with wide angle lenses, but it also appears on telephotos like the Canon 70-200 f/2.8.

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