The longer the lens, the more effective the proper lens hood will
be. As an example, the hood on the 400/6.3 Zuiko is so deep that
it protects the front element from light coming from almost any
direction except nearly straight-on. On the other hand, the hood
for the 21/2 Zuiko does next to nothing. I just spent a few
minutes playing with mine, and it's a real challenge to get it
into any position relative to a light source where it has any
effect whatsoever.
Lens hoods on wide angles do next to nothing, and hoods on the
shorter zooms don't do much more. On a zoom lens, the hood has to
be designed to accommodate the shortest focal length, so when you
zoom to a longer focal length, you can end up with a lens hood for
a 28mm lens on a 105mm lens. I don't think most of us would put a
28mm hood on a 100mm prime lens, but with a zoom, we have no
choice.
I've got proper hoods for all of my lenses, and if the hood is
built in, like on many of the Zuikos 100mm and longer, or fits
reversed on the lens, like on the Tamrons, I almost always use
it. But if it's somewhere in one of the camera bags, like the
hood for the 21/2, for example, then that's where it stays more
often than not.
Walt
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