Beginner Softbox/Octabox Size for Speedlights

Phil V said:
If you put the eye dropper on in ps, you'll see the colour as numbers, and 255, 255, 255 is the RGB value for pure white.

If the centre of the softbox is pure white, it's blown, so we can't tell if it's just a bit brighter than the outside or 3 stops brighter (once it's white, it can't become 'more' white).

Dialling down the power till the centre is no longer blown will give an accurate contrast between the hotspot and the edge.

HTH
Click to expand...
Ah, ok.
So to better show the spread, should I turn down the flash? Or underexpose the shot?
 
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