I have tried a "tent" diffuser illuminated from above the tent. this was cut from a 2 ltr milk bottle, and it was very effective, but too much so for some insects, resulting in a flat top lit effect.
Has anyone found/made a separate diffuser, for each flash unit. I understand that the diffuser material needs to be at least 30 t0 50mm from the flash unit.
On the net I have seen a huge variety of alternatives for larger more conventional flash units, but the compact nature of the STF 8 seems to make those that I have seen impractical.