by ʇolɐǝz ǝɥʇ qoq

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This question already has an answer here:

If a hood is to block unwanted light coming from the sides of the lens in use, because such light is detrimental to the picture taking, then hoods would be used at all times,because there almost always be light hitting the lens from all angles, however hoods are not used that much.

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marked as duplicate by akram, NickM, jrista Dec 18 '13 at 15:31

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

"...however hoods are not used that much." I guess it depends who you hang out with. Mine are never off their lenses! – Dan Wolfgang Dec 18 '13 at 15:36

The reduce or prevent lens flare from bright light sources at the edges of the lens.

It's not a bad idea to you use lens hood whenever possible as it will help prevent the lens from knocks.

I don't really agree with the statement that they aren't used that much because in fact they are used very broadly.

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