Pretty straight forward question. What does a lens hood do?
1 Answer
A lens hood has two purposes - one is to shield the lens elements from stray light - either directly from the sun, from passing cars, from a flash, etc. This stray light can cause lens flare and reduced contrast, so it is best to limit it.
Its also useful for avoiding bumps to your lens or filter. I use mine a lot in the car, because my lens is always very close to the window.
(It can also make that huge telephoto look that much more impressive)
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\$\begingroup\$ Another advantage when shooting close to a window is that you can press the lens hood up against the glass, and block out any light from the camera side of the window and reduce reflections. \$\endgroup\$– EddCommented Jul 22, 2010 at 15:57
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4\$\begingroup\$ Impressive-looking telephotos are very important in situations where you have to look like serious photographer, for example if you're trying to get past security into press sections on a show or sports event. \$\endgroup\$– cheCommented Jul 22, 2010 at 16:16
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2\$\begingroup\$ It also helps to keep rain off the front of the lens. \$\endgroup\$– vclawCommented Aug 3, 2015 at 12:29
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\$\begingroup\$ Do I need hood in conical petal form to make product photography in white shooting tent outside when sun is shining? Now same question except that do I still need to have hood on when making same photography indoors with limited lighting source? I have Panasonic G5 with 14-42mm lens kit. \$\endgroup\$– Boris_yoCommented Oct 10, 2015 at 12:04