Originally Posted by mgb74
I don't know the guide number of the Sunpak 555, but given a shooting distance of 25ft, you might find the mat acetate just enough diffusion. At 25 ft, you might be concerned about too much diffusion.
The Guide number is 150 with ISO 100.
I do use a digital device in my photographic pursuits when necessary.
When someone rags on me for using film, I use a middle digit, upraised.