Fancierstudio Marco Photography O-Flash Ring F155 For CANON 430EX/430EX II/ 300D/350D/400D/450D/1000D NIKON SB800 SB600 /D80/D50/D70/D300/D200 By fancierstudio F155 Inner ring diameter: 4.3 inches/10.9 cm (fits most of the lenses) Outer ring diameter: 7.5 inches/19.0 cm Compatible with:NIKON SB800 with D80/D50, NIKON SB600 with D70/D300/D200, CANON430EX/430EX II with REBEL XT XTI 300D/350D/400D/450D/1000D These models are also fit for the other Camera with flash sets like Canon, Nikon, Olympus, Pentax, Samsung, Sony and so on, only if you can measure the diameter correctly, and choose the right model, you can just enjoy the wonderful photography.