Using the broncolor range of softboxes just became even more creative and flexible. An Edge Mask is an accessory for Softboxes. It is like an additional diffuser which you can easily mount on the front of the Softbox thanks to the Velcro.
The new Edge Mask helps turn the rectangular sizes of softboxes in to a rim light, allowing for subjects to be photographed in-front of and against the softbox, with the light wrapping around the subject from behind.
The inner part of the Edge Mask is a completely dark square where no light is passing. The light only shines through the edges creating a frame of light. The frame is 7 cm (2.8") wide for the smallest Softbox (35x60), 10 cm (3.9") wide for the medium-sized (60x100 and 90x120) and 15 cm (5.9") wide for the biggest Softbox (120x180).
The purpose of the Edge Mask is to create a contour light around your subject. To achieve this nice effect, you place the Softbox with the Edge Mask exactly behind your subject.
The frame of light will illuminate the edge of your subject while the background stays black. To avoid having the frame of light in your image it is more convenient to use long lenses.
The Edge Mask can be used for stills as well as for portraits.