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Grey filters that let less light in, for smooth video in sunshine.
A 52mm magnetic variable ND filter (ND2-ND32, 1-5 stops) with German HD glass and hard-stop adjustment for precise exposure control.
A 52mm magnetic variable ND filter (ND2-ND32, 1-5 stops) with German HD glass and hard-stop adjustment for precise exposure control.
£19.99
52mm clip-on variable ND filter (ND2-ND400) for smartphones, with adjustable light reduction and 360° rotation.
52mm clip-on variable ND filter (ND2-ND400) for smartphones, with adjustable light reduction and 360° rotation.
£13.99
A 37mm variable ND filter with phone clamp, offering ND2-400 light reduction for creative smartphone photography.
A 37mm variable ND filter with phone clamp, offering ND2-400 light reduction for creative smartphone photography.
£11.99
Clip-on variable ND2-ND1000 filter that fits most phones and tablets, letting you control light and exposure for photos and video.
Clip-on variable ND2-ND1000 filter that fits most phones and tablets, letting you control light and exposure for photos and video.
£27.99
4-piece magnetic UV, CPL, ND32 and HD filter set for iPhone 17 Pro and Pro Max camera lenses.
4-piece magnetic UV, CPL, ND32 and HD filter set for iPhone 17 Pro and Pro Max camera lenses.
£18.99
Screw-on neutral density filter available in ND2 to ND32 strengths and multiple thread sizes to control light without affecting colour.
Screw-on neutral density filter available in ND2 to ND32 strengths and multiple thread sizes to control light without affecting colour.
£10.99
An ND filter, short for neutral density, is grey glass that lets less light into the camera without changing its colour. On a bright day a phone often has too much light. Most phone cameras have a fixed aperture, the opening that lets light in, so in sunshine the only way the phone can avoid a white, overexposed picture is a very fast shutter speed. For a photo that is fine. For video it can make movement look jerky, because each frame freezes the action sharply.
Filmmakers work to a rule of thumb called the 180-degree rule: a shutter speed about twice the frame rate, such as 1/50 of a second at 25 frames a second or 1/60 at 30. An ND filter cuts the light enough for the phone to use a slower shutter like that in daylight, which gives the natural blur of movement people know from films. Strong ND filters are also used for long exposures in daylight, turning moving water and clouds smooth, with the phone on a tripod.
ND filters are marked by how much light they cut. Each doubling of the number cuts one more stop, which halves the light again: ND2 cuts one stop, ND4 two, ND8 three, ND16 four and ND32 five. An ND1000 cuts about ten stops. Some makers mark the same filters by density instead, with 0.3 for one stop. A variable ND turns to change its strength, so one filter covers a whole span.
A variable ND also comes with the magnetic system for the iPhone 15 Pro and 15 Pro Max in CPL filters.
An ND filter only helps if you can set the shutter speed yourself, which needs a manual or pro video mode in the phone's camera, or a filming app. Set the frame rate, set the shutter to about twice it, then fit the filter and turn or change it until the picture is neither too bright nor too dark. For long exposures, put the phone on a phone tripod and take the picture with a timer or a remote shutter.
Only if you want smooth, film-like movement in bright light and are willing to set the shutter speed yourself.
It is made not to: neutral density means it cuts all colours of light alike, so the picture is darker but not tinted.
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