This is made as two telescoping, black plastic tubes. At one end are Bowens mount tabs, at the other end is a glass fresnel lens, and in the middle you twist the two telescoping tubes to get the lens to move towards or away from the mount. It's solid and well built.The NG-10X Fresnel Focusing Lens adapter adopts Bowens mount,suitable for most of LED studio light and flash light. It’s perfect for shooting profile, long distance shooting or old-style Hollywood effects with four color gel filters. | Rotary telescoping design, by rotating twisting to adjust the light focus angle from floodlight to spotlight (10-40 degrees) and can increase brightness of original light by up to 5-10 times.With a smaller point source as speed lights.it may work better. It allows you to get a concentrated spot of light with a nice falloff, and adds a lot of control to an otherwise "light bomb" of light. With a speedlight + bowns adapter, it creates tight spot which could be used the most as a background light. | Four color filter(including yellow, red, green, blue filters) are provided and snap into the front focus lens.they're easy to snap on and can be changed quickly for creating color accents or special effects.Angle adjust from 10 ~ 40°. 5-10 times brighter when most focusing.Great light modifier for Bowens mounts spotlight studio light as Godox sl-60w sl-50w etc Inexpensive. It could replace grids and barn doors for your lights,especially for duplicating Hurrell-style Hollywood portraits. | Good lights can make a difference as-well.It increases background spot light significantly using a speedlight. Compatible with flash light LED studio light with power less than 150W.Note: This Studio Light fresnel focus lens adapter only work for Bowens mounts.Light is well controlled and can focuses well.Inexpensive option if you need a fresnel lens.Would be better with constant light LEDs than strobes. 2-year quality warranty.Contact EXMAX for any concern,we are striving to serve you better.