This narrow shaped Deep Octa reduces the spread of light and offers sharper shadows compared to standard sized octagonal softboxes. It provides a very even diffuse light over the front screen and a very direct crisp light when used without diffusers to give a beauty dish look. The Elinchrom Rotalux Deep OctaBox 39" diameter softbox emits a more focused soft light than most OctaBoxes when used with its included inner and outer diffuser. With either, or both of the diffusers removed, this box acts like a super-large reflector for your flash head. Another innovative feature which distinguishes Elinchrom softboxes from others is the lightweight dedicated speedring, which utilizes knurled, spring-action sockets to connect the stainless rods which form the frame of the box, to the ring. This allows easy assembly of the box in a de-tensioned state. The user then simply pivots the sockets 90 degrees until they lock into place to tension it for use.The 39" (100 cm) Deep Octa shape features a large surface area which renders a "wrap-around" light quality especially when used at close range. It is ideal portraiture.