RinbowImaging Lens Hood for PENTAX-DX 35mm F2.4 AL, FA 50mm F1.4, FA 50mm F1.7, F 50mm F1.4, F 50mm F1.7, A 50mm F1.4, A 50mm F1.7, A 50mm F2.0, replaces PENTAX PH-SA49 Replacement for PENTAX PH-SA49 Lens Hood for PENTAX-DX 35mm F2.4 AL, FA 50mm F1.4, FA 50mm F1.7, F 50mm F1.4, F 50mm F1.7, A 50mm F1.4, A 50mm F1.7, A 50mm F2.0 lens Designed to prevent unwanted stray light from entering the lens. Ensures no problems with vignetting or motor functions. Added benefit of extra protection from accidental impact. Made of ABS