The difference between a bare softbox and sofbox + diffuser might be obvious, and this lesson will show you the difference between an outcome from each light modifier.
The main difference between softbox and diffuser panel is how the light is spread on the “working” surface: good softbox is suppose to produce even flat light on its front screen while diffuser may have very different pattern, depending on how we highlight it. What does it mean for me when I shoot some glossy, especially dark glossy object? The reflection from that light. 
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