The Westcott Recessed Mega JS Apollo (50 x 50) is a softbox based on an umbrella frame. It needs no speed ring to attach it to a studio flash head. Simply open it, and slide the shaft into the umbrella receptor on the flash head. A lightweight reflector plate may be purchased separately to produce indirect lighting. You can also use the Mega JS Apollo with your on-camera flash by purchasing Westcott's 5015 Shoe Mount Bracket (BH# WESMMA).