Darryl Roberts
Member
If you have a Speedlight, Rayflash makes a relatively inexpensive adapter. I don't think they're in business anymore, you should be able to find one used. A little plastic-y, but it would allow you to experiment to see if the effect is what you want. For fill, you really don't need too much power, a stop less than your main light.
View attachment 238005
Wow, interesting option, thank you.