Diopter stages | Single stage | Single rotating stage | Flexible shade
6.6x6.6 → 5x6 | 6.6x6.6 → 4x5.65 | 4x5.65 → 4x4
•SQUARE & RECTANGULAR- 6.6" x 6.6" | 5" x 6" | 4" x 5.65" | 4" x 4" | 45mm x 70mm
•ROUND- 6" | 138mm | 4½" | Series 9 | 40.5mm | 30.5mm