The Fotodiox Universal Gobo Image Projection Attachment allows you to project unfocused or sharply focused gobo slide patterns or an optical spot of various size using the built-in iris ideal for precise and selective lighting of a subject Speedotron & Compatible Lights - Popular models include Speedotron Black Line Speedotron Brown Line Please Note Works best on monolights that are focusable such as the Popspot Ultra style of lights All pictures are for illustration purposes only Actual product may vary slightly due to ongoing improvements in design