The BD-DS811 from Falcon Eyes is a metal valve set for your DS-811. With a valve set you can control the light more. The valve set is 16 cm deep. The BD-DS811 is completely made of metal and finished in black.
When you use the DS811 for photo or video exposure, in some situations you may not want the light to disperse too much. To do this, you can use the BD-DS811 as a tool to limit the light to all sides individually. A honeycomb is also available for the DS-811, which can be found in the optional accessories of the DS-811.