A graduated neutral density filter is dark across one half and clear across the other, used to hold back a bright sky while leaving the darker foreground untouched. It solves the most common problem in landscape photography: a sky several stops brighter than the land, more contrast than the sensor can hold in one frame. Used well, a grad balances the scene at capture so both the sky and the ground keep their detail. For the underlying concept, see our explainer on the graduated ND filter.
The filter is a square or rectangular sheet that slides in a holder on the front of the lens, so you can move the transition up or down to sit exactly on the horizon, unlike a screw-on round ND filter that darkens the whole frame.
Choosing the right grad
Match the transition to the horizon. A hard-edge grad shifts abruptly from dark to clear and suits a flat skyline such as a seascape. A soft-edge grad blends gradually and is more forgiving when hills, trees, or buildings break the horizon, since a hard edge would darken anything that pokes above it. A reverse grad is darkest at the center and lighter toward the top, designed for sunrises and sunsets where the brightest band sits right on the horizon. A two-stop or three-stop grad covers most conditions.
Positioning and metering
Set the camera on a tripod and compose first. Meter the bright sky and the foreground separately, note the difference in stops, and choose a grad that closes most of that gap, then slide it down until the transition rests on the horizon. Use live view at the working aperture, or look through the viewfinder, to line up the edge precisely. Check the histogram after the shot to confirm the highlights are no longer clipped and the shadows still hold detail.
You can stack a grad with a polarizing filter to cut glare and deepen a blue sky at the same time, though watch for vignetting when filters are stacked on wide lenses. Shoot in RAW so you have latitude to finish the balance in editing.
Grad filter or digital blending
A graduated ND is the in-camera alternative to exposure blending and HDR, where you combine several frames at different exposures in software. Many photographers use both, getting the balance close with glass in the field and finishing in post. The grad shines when the horizon is clean; digital blending wins when the skyline is jagged, since no straight filter edge can follow an irregular horizon without darkening the peaks.
Common mistakes to avoid
- Using a hard-edge grad over a broken horizon, which darkens mountains, trees, or buildings that rise into the sky.
- Placing the transition in the wrong spot. Use live view to line it up exactly on the horizon.
- Choosing too strong a grad, which leaves the sky darker than the land and looks unnatural.
- Stacking filters on a wide lens without checking the corners for vignetting.
Frequently asked questions
Hard, soft, or reverse grad, which do I need?
Hard edge for flat horizons such as seascapes, soft edge for horizons broken by hills or trees, and reverse for sunrises and sunsets where the brightest light sits on the horizon. A soft two or three stop grad is the most versatile single filter.
Can I just fix it in editing instead?
Often yes, through exposure blending or HDR, especially when the horizon is irregular. A grad still helps by capturing a more balanced single frame, which means less work and cleaner files in post.
Screw-in or square filter system?
A square system in a holder is far more flexible, because you can slide the transition to match the horizon. Screw-in grads lock the transition to the center of the frame, which rarely lines up with your composition.
A worked example
Suppose you meter the bright sky and get 1/15 second at your chosen aperture, then meter the foreground and get 1/2 second. That is a three-stop difference, more than the sensor will hold cleanly in one frame. A three-stop (0.9) graduated ND placed over the sky closes most of that gap, so a single exposure records detail in both halves. If you only carry a two-stop grad, use it and recover the last stop in editing, or bracket and blend. Always recheck the histogram after positioning the filter to confirm the sky is no longer clipped.