Hey shawrg,
If you can, try to get about 6inches away and see if the corner is dark in the shots. 1.6ft is the maximum distance for shooting in macro with the G10, but I'll probably be shooting either 1 foot shots or 6inch shots for most of my pictures with flash.
I failed at uploading the images but I couldn't tell much difference with the diffuser from 4 inches vs 9 inches with or without zoom. The big difference is with vs without diffuser.
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