Gel filter set, mixed diffusion (fits Series 400 filter holder).

Diffusion gels go from a slight spread of the beam (light) up to wide - angle spread (white diffusi- on) and even offer diffusion of the light in only one axis (silk).
- Tough frost (TF)
- Powder frost (PF)
- Light tough frost (LTF)
- Tough silk (TS)
- Tough white diffusion (TWD)