This Colour Filter Set is compatible with the Speedlite 600EX II-RT and includes Colour Filter SCF-E3OR1 (Light Orange), Colour filter SCF-E3OR2 (Dark Orange). SCF-E3OR1 adjusts colour temperature of backgrounds and subject by suppressing the bluish light of flash output, and taking advantage of incandescent lighting to create warmer tones. SCF-E3OR2 adjusts colour temperature of backgrounds and subjects to more natural colours when shooting with flash under incandescent lighting situations.