One half of a top hat, used when only a portion of the spill/flare needs to be masked. For example, often used on box boom lights, to mask flare on the DS (audience) side, but leave the US portion of the beam un-restricted.
Link to one manufacturer. Article on the application of half top hat by City Theatrical: http://www.citytheatrical.com/newsletter/HalfTopHats3.htm.
Link to one manufacturer. Article on the application of half top hat by City Theatrical: http://www.citytheatrical.com/newsletter/HalfTopHats3.htm.
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