Since I have a wireless flash I figured I may as well get a tripod adapter and some sort of diffuser so I can supplement strobes, and especially use it off-camera at locations I wouldn't haul ...
I notice that hotshoe flashes (e.g. Nikon SB-800) typically have a Fresnel lens system to focus the light, but studio strobes (e.g. Photogenic Powerlight 1250) do not. What's up with that?