Note the witty title today. These aren't really a very witty subject - they are a grey filter darker at the top than the bottom, and they enable you to have a lit ground with a darker sky. They're pretty essential frankly, yet they are seen as esoteric. If you want to take landscape shots where you can see the ground yet the sky isn't blown out, then you need one. This is probably the most useful tip I've given you so far...
Interesting point. I used to have one of those and never knew what it was for! Thanks Luis!
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