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Graduated NDs, or more simply ‘grads’, have the ND effect only on the top half of the filter, so that the bright sky can be balanced with the terrain below. This correction cannot be made in post processing. Typically graduated filters are used to enhance the sky or terrain, or balance the luminosity of the sky to the luminosity of the terrain.
Graduated filters (or more simply "grads") have the effect on half of the filter. The most common use for a graduated filter is to reduce the luminosity of a bright sky balancing it to the terrain below. The advantage of using a grad filter, rather than HDR techniques is a far more neutral color representation than the "candy rainbow" side effect resulting from HDR processing. Plus, it's far more authentic and satisfying to create a great image with a single exposure, and far less work in post processing too.
Soft Edge Grads are far and away the most popular type of grad. The soft transition between clear and effect allows the transition to be hidden in a scene containing variances on the horizon line - such as a mountain range. Soft grads are extremely versatile and easy to use.
Hard Edge Grads feature a defined transition between the clear and effect. These filters are ideal for reducing luminance of the bright sky over a defined horizon line, such as a seascape. Hard Edge Grads are an essential tool for both fine art photographers and professional cinematographers alike.
Reverse Grads feature the highest intensity of the effect near the center of the filter and reduce in intensity toward the top edge. Reverse grads are specifically designed for photographing the sunrise or sunset when the highest luminosity is near the horizon. Although less well known than hard and soft grads, those who know about reverse grads love them. While creating our Landscape Filter Kit, Colby Brown insisted that a reverse grad be included.
Blenders feature a transition that occurs over the entire length of the filter from top to bottom (or bottom to top, because remember that all grads can be used with the effect on the bottom as well). Blenders are used when the scenery and horizon are too complex to hide the transition of a soft edge filter.
Color Grad filters come in every color of the rainbow and more. Beyond single color grad filters, we also made complicated color grads such as the sunset and twilight grads that have complex graduations from red-orange-yellow and blue-violet-magenta respectively. It's a great way to enhance the fire or tranquility of your sky. Color grads are typically available in densities of 1, 2, 3. These densities don't correspond to specific stops of light reduction like ND grads. Rather, you can think of 1,2,3 as simply light, medium, heavy.