Moment's new CineFlare Streak filters promise anamorphic-style flares without a specialized lens: Digital Photography Review
Flare PV Filter
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Streak Special Effects Lens Filter, Water Resistant High Light Transmittance Anamorphic Light Effect Filter For Video Shooting Blue Streak - Walmart.com
Streak Filter - 405STRK2 – The Tiffen Company
Schneider 4 x 5.65" 1mm Blue True-Streak Filter (68-500156)