Photography - Graduated Neutral Density

Cokin P121S P Series Graduated G2 Soft Gray Neutral Density Resin Filter

Cokin X-Pro Series Filter - X121M Gradual Nuetral Grey G2-Medium (ND4)

Please note that by using Graduated Neutral Density filter, it really helps a lot. It helps to show more texture on the clouds as seen below. The top picture is without GND (Graduated Neutral Density) and the bottom picture is with GND (Graduated Neutral Density).