This reflector is designed to give a wide, even coverage. The important requirement of an Umbrella Reflector is that when used in conjunction with an umbrella it is evenly filled with light (no central hot spot) whilst keeping a minimum distance between the flash tube and the umbrella.
It is also important that the profile of the reflector is not so wide that it masks the umbrella.
Reviews Elinchrom 16cm 90 Degree Brilliant Reflector (26143)