Millie was chosen as a test subject for the diffuser I am presently developing for the SB-R200 on front of the lens and these results were obtained using plain copy paper as the diffuser medium.
All shot at 1/60s, f/16-f/22, ISO400, 105mm with 68mm ext tubes giving 2:1 magnification, 12mm frame width when un-cropped.
No 1
No 2
No 3 - cropped horizontally
The copy paper has reduced the flash power somewhat but has made a great job of reducing highlights. To overcome this I pushed the ISO up to 400 anticipating some increased noise but found that because the highlights were reduced the exposure was able to be pushed more to the right.
Grahame