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| p.1 #3 · Need Help with Canon Speedlite and shoot-thru umbrella |
...How do I avoid the hot spot on the face (especially the nose tip) when I use the Canon Speedlite and shoot-thru umbrella as main light?
As with any light, the Inverse Square Law comes into play with respect to fall-off. If the light is very close to the subject, the difference in intensity between the closest part of the subject's face (like the nose) and the furthest part (like the ears) will be greater than if the light is further away.
So, one way to avoid the hot spot you mention is to use a longer lens and shoot from further away. That would apply to on-camera flash.
Another way is to use off-camera flash and move the light further away. Since you mention a shoot-through umbrella I assume that you're using off-camera flash.
Yet another way is to make a reducer that you can add to the umbrella's center to cut down the intensity in the center of the light pattern. One or two layers of diffusion fabric should work well.
The final option is to skip the umbrella all together, and go for a beauty dish; they come with a hot-spot reducer already installed. There are versions specifically designed for flash guns, or you can get flash mounts for regular beauty dishes.
I use a flash-gun model, the 20-inch RPS Studio BeautiDish (note the spelling) which I believe is no longer being made, but Adorama still has some in stock:
Here are some pictures of mine: