Never used Rosco The Stobist Collection. Rosco, a leader in color filters, has assembled the essential collection of filters for use with your standard strobe. Rosco has been manufacturing color filters since 1910 and the Congeal range of color filters has earned two Academy Awards. Working with David Hobby, the founder of www.strobist.com, The Strobist Collection contains the Cinegel filters photographers need, properly sized to fit most shoe mounted strobes. Not compatible with round head strobes (Godox, Westcot, etc).