What are ND Filters? (When and How You Should Use Them) (2022)

Related course: Infinite Exposures

There will be times where you need to capture scenes that are too bright for the camera. In these situations, Neutral Density (ND) filters come into play.

What are ND Filters? (When and How You Should Use Them) (1)

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What Does an ND Filter Do?

Neutral Density or ND filters may sound too technical to use for a beginner photographer. To make it easier to understand, you can think of them as sunglasses. All they do is reduce the amount of light hitting your sensor or film plane.

ND filters are perfect for bright scenes that even low ISO levels can’t manage. They’re also useful for doing long exposure shots in daylight.

You can attach the filters in front of your lens like any regular filters. If they’re round, you can screw them onto the threads of your lens. And if they’re square, you can slide them into a filter holder.

For the most part, using ND filters is easy. But knowing when to use them is the tricky part.

Why Should You Use ND filters?

Let’s say you are photographing a lighthouse, with the sea in the background. Your camera settings could be something like this: ISO 100, Shutter Speed 1/1000 second, and an aperture of f/8.

The scene is well exposed, but the waves in the background are a little distracting. We want to smooth them out. And to do that, we’ll need to do a long exposure.

A long exposure records the scene over seconds, stopping our camera from freezing the movement of the water.

We need a shutter speed of 15″ (seconds), so we change the shutter speed on our camera. Except now, we have added 14 stops of light into our scene. So it’s now just a white, blank image.

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For correct exposure, we need to take out 14 stops of light using the other settings.

The ISO is at its lowest, so thatwon’t help. The shutter speed or f-stop can go from f/8 tof/11,f/11 tof/16, andf/16 tof/22. That’s only three stops until we reach our maximum (four if you can go to f/32 or ISO 50). Not to mention that it if you go above f/16, you might see a diffraction effect resulting in unsharp images.

So what about the other 11 stops?

For this purpose, we need a 10 Stop ND filter. We can’t getprecisely 11 stops, so we’ll need to deal with the extra stop using editing software. But with this combination, we can finally create proper exposures.

When Should You Use a Neutral Density Filter?

There are plenty of situations you can use the neutral density filter.

In portraiture, using this filter would allow you to shoot with a wide aperture even in the middle of the day. That way, you don’t have to end up with images with ugly highlights.

For landscape photography, you can use it to smoothen bodies of water through long exposures. It’s also perfect for creating wispy clouds or even dreamlike forests.

And for architecture photography, you can use it to “erase” people in the scene. Since people move around, they won’t show up in your photos if you do long exposures. You can learn more about this technique by reading this article.

To use filters ND kit, you’ll have to figure out how much light you have to cut out first. If there isn’t enough light, then perhaps putting an ND2 filter should be enough. But if your image still looks overexposed, then perhaps you can try an ND4 or other options until the lighting looks correct.

If you’re using a variable ND filter, all you have to do is twist it until you get the correct exposure. It’s that easy!

What are ND Filters? (When and How You Should Use Them) (4)

What Are ND Filter Ratings?

ND filters come in all different ratings for all different sorts of situations. When we talk about exposure, we think in terms of stops. A 2-stop ND filter stops twice as much light as a 1-stop filter.

We use stops to make the transition between camera settings and filter easier.

A stop in photography either doubles or cuts the amount of light in half. So that means a 1 stop ND filter cuts the light by 50%.

A 10 stop filter is stopping the light by ten halves in a row. It is essential to do this sequentially.

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Companies advertise filters in different ways. For example, instead of saying stops, they might use the Optical Density of `1.5′ or an ‘ND factor of 32’.

What are ND Filters? (When and How You Should Use Them) (5)

When you capture long exposures, it’s only the shutter speed you will change. If you have a 12-second exposure without a filter, then you add a one-stop ND filter, you have effectively halved the amount of light.

To counterbalance this, you have to increase the amount of time you let light into the camera, in this case, by doubling it. One second becomes 2 seconds.

See the below table for all ten examples. The new exposure times double sequentially. So a 4-stop ND filter will mean you have to double the initial exposure four times.

What are ND Filters? (When and How You Should Use Them) (6)

What Are the Different Types of ND Filters?

Mount Types

Before we talk about the different like of Neutral Density filters, let’s discuss the mount types first.

Just like any other filters, there are various ways to attach them to the lens. Below is a list of the few of the most popular options.

  • Slide-In. The slide-in version of the Neutral Density filter requires an adapter or filter holder. This screws on to the front of your lens, and once attached, you can slide the glass into it.
  • Screw-On. The screw-on version allows you to screw it on to the front of the camera lens.
  • Drop-In. There are types of ND filters that sit in your camera body, just in front of your mirror. These are preferable, as they do not refract light as the others could.

All these mount types have their pros and cons. Slide-ins allow you to use the same size of filters on almost any kind of lens. But they’re bulky and aren’t always the best choice if you move around a lot.

Screw-ons are the most secure option, especially if you move around a lot when shooting. But you’ll need the proper size of filters to fit lenses with different diameters.

Drop-in filters are both secure and let you use one size of filter for any lens. But they can be quite expensive.

The two main types of neutral density filters we’ll talk about below may have any of the mounts we mentioned. So it’s up to you to weigh the advantages of each option and figure out which you like the best.

Neutral Density Filter Kits

Most neutral density filters come in kits.

On average, a kit has three to 5 filters with varying ND numbers. Each neutral density filter has a different rating. It starts from ND2 to ND8 or ND2 to ND64 or more.

What makes the neutral density filter kit useful is that you can combine filters to achieve the ND number you desire.

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So let’s say you need an ND10 filter, but your highest option only goes up to ND8. What do you do? You can easily combine screw on an ND2 on the ND8 already on the lens, and you got yourself an ND10 neutral density filter!

Variable ND Filters

A variable ND filter is made of two separate pieces of glass, which are polarised. The first layer is linear, and the other is circular.

These two polarizers allow you to control different intensities of light coming through the camera. In other words, using a variable neutral density filter means you don’t need ten separate filters anymore.

All you have to do is twist the filter ND to offset the polarisation. When polarized at a 90-degree angle, the filter doesn’t let in any light. At 0 degrees, it lets in 100% light.

A variable filter works incredibly well. But it can also be quite expensive. Furthermore, you should be aware that it can introduce artifacts into the out of focus areas.

In most cases, you’re better off buying a kit of several neutral density filters. They not only lessen the chances of projecting artifacts, but they’re also cheaper.

Graduated ND Filters

A graduated ND filter is slightly different from a regular ND filter. Only a part of it has an ND coating while the other half doesn’t have any at all.

You won’t see any difference in the lower half of the filter. But the f-stop reduction gradually gets higher as you go up. The highest ND number of a variable neutral density filter is usually around two-thirds of the way up.

A graduated ND filter is for darkening a specific part of the image, not the whole scene. Photographers use them mostly for skies, especially since it can be 3+stops lighter than the horizon.

The purpose of the gradations in the filter is to make the transition from ground to sky a lot smoother. Otherwise, the separation line between the light and darkness would be too visible.

You can rotate these graduated filters if the lightest element is in the bottom half of the frame.

Likewise, if only the top third of the image is too bright, you can move the filters up or down to compensate. They come in the same strengths as the ND filters.

DIY Neutral Density Filters

Many articles on the internet offer cheaper solutions for the best filters. But the best option for DIY photographers is to use a welder’s glass to reduce light. It’s just a fraction of the cost.

Welder’s glass gives you ten stops reduction in light. However, using it will require you to do a lot of colour management in post-production. If you are interested, read this article here on how to process the final image.

What are ND Filters? (When and How You Should Use Them) (7)

What Is the Best Neutral Density Filter?

At ExpertPhotography, we get to play around with many items hanging around our studio. I had previously bought an ND filter pack from Amazon that I was looking forward to using. This was before I did any professional research.

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The pack I bought was theRangers 8pcs ND Filter Kit. I finally got it and went out to try it. It’s what I decided to use on ourHow to Use an ND Filter to Remove People from Long Exposure Shots article.

From my experience, these filters may not be strong enough on their own. And stacking them isn’t a great idea. They are plastic and will give your images a vignette, a coloured tint, and a higher possibility of refracted light.

That’s why I went with Lee’s Big Stopper later. It’s has a 10-stop reduction in light which is quite impressive. It won’t be enough for a solar eclipse (you’ll need two), but it will help in your landscape or street photography.

On a serious note, these filters aren’t cheap. But as they say, you get what you pay for. So if you’re going to use them a lot, then there is no question – Lee Filters are the way to go.

What are ND Filters? (When and How You Should Use Them) (8)

What Other Equipment Will You Need?

The first accessory you will need when using these filters is a tripod. You’ll need it to stabilise your shots especially if you’re doing long exposures.

A cable release or remote trigger is also essential because it doesn’t require you to touch the camera physically. Pressing the trigger remotely reduces the amount of camera shake and blurriness in your image.

And finally, you’ll need a lens cleaning cloth. You’ll be touching and changing out all the time. So it’s essential that you have something to wipe off the smudges on the lens.

Common Problems When Using ND Filters

I found several issues using ND filters. After my experience, I would recommend getting mid-range glass ND filters. The Rangers 8 pc ND filter kit is a plastic version and gave me a purple colour cast and a blurry final image.

Do not try stacking the filters if you have a cheap set. I know it is tempting to put a 4-stop ND filter and a 6-stop ND filter in replacement of a 10-stop ND filter. But if your kit is made of plastic, the result isn’t going to be fantastic. It willcause light refraction, where the light entering will bounce between the two pieces of glass, showing you dust and light spots.

Furthermore, vignetting will occur as the light now hits your sensor from different angles. And if they give you a colour cast, putting two together makes it twice as bad and more challenging to remove.

We have a great guide to camera lens filters you can check here.

Conclusion

You’d be surprised how digital cameras tend to overexpose images even in normal lighting conditions. No matter what type of photography you’re into, you need to invest in ND filters. Always bring them in your camera bag. You’ll end up needing them more than you think.

To master long exposure photography, don’t miss out on our course – Infinite Exposures!

FAQs

When should an ND filter be used? ›

Shooting the flowing water particularly the waterfall is a time when you want to use an ND filter. Capturing the moving water with slow shutter speeds((1/15th of a second and longer) can create a silky effect.

How do you know what ND filter to use? ›

And nd filters can be labeled in several ways one is optical density the darkness of the glass.

How do you use nd camera filters? ›

It off make sure your ND filters are clean and then screw them or slide them into place. Use your

Do you really need ND filters? ›

Why Use ND Filters? ND filters are particularly useful for maintaining the color effect of images while controlling the exposure in bright light conditions. A filter prevents excess light from reaching the camera sensor so photographers can shoot in a wider aperture for longer periods.

Should I use an ND filter for sunrise? ›

Neutral Density (ND) Filters

These are exceptionally handy for many scenarios, but they're especially useful for sunrises and sunsets in giving you longer exposure opportunities when the sun is still producing a lot of light and your shutter speed can't quite get low enough for a really long exposure.

Can I use ND filter at night? ›

If you put an ND filter on it is going to give you a color cast during long exposures. Yes you can use a polarizer, but avoid Neutral Density filters. Shoot when the sun is going down and keep your camera at a low ISO like 100 or 200. Don't get me wrong, I love ND filters but not at night.

What ND filter to use in bright sunlight? ›

A 3-stop or 0.9 density ND is ideal for waterfalls in bright sunlight, slowing the exposure to a second or so, depending on the f-stop and ISO used. A strong 10-stop or 3.0 ND filter can blur clouds over several minutes, even on a bright sunny day.

How do you shoot a sunset with an ND filter? ›

Using ND Filters for Extreme Long Exposures and Sunset Photography

Do ND filters affect autofocus? ›

Turn off autofocus. If you put a dense ND filter on, your camera will not be able to focus properly and may often default to infinity. This would result in an unusable, out of focus image.

How do you expose with ND filter? ›

How To Perfectly Expose For Any Area When Using ND Filters
  1. Take shot(s) normally. I always like to bracket my images normally, without an ND filter first. ...
  2. Go To Manual Mode. ...
  3. Decide how long you want the exposure. ...
  4. Set optimal aperture and ISO. ...
  5. Change to spot metering. ...
  6. Choose your spot. ...
  7. Cover viewfinder. ...
  8. Steady tripod.
2 Dec 2015

What is the difference between an ND filter and a polarizing filter? ›

They work differently. Basically, a polarizer is used for blocking light reflected off a surface, while an ND just makes the whole scene darker. Polarizing filters can enhance the color of the image while ND filters just block the light entering the camera. It does not change the overall color of the image.

What filter is best for sunsets? ›

Reverse Graduated Neutral Density filters are perfect for sunsets and sunrises where the horizon in the image allows you to use them. Carry some soft graduated filters for times when the land isn't flat, or you want to combine filters for a stronger effect.

Should you use ND filter indoors? ›

There may be a few cases where you really want very long exposures indoors. If you're shooting videos with your DSLR then it makes sense as your shutter speed is effectively fixed at 1/50s so you may need a ND indoors if you want to shoot at f/2.8 and there is some strong stage lighting.

Why do we need ND filters? ›

Use an ND filter to lose the choppy look that drone footage can have when shooting with generous amounts of light and short shutter speeds. By reducing the light that's reaching the sensor, an ND filter enables you to select longer, cine-style shutter speeds for smoother motion.

Should I use a ND filter for sunsets? ›

A neutral density (ND) filter is essential for landscape photography and comes in handy for sunset and sunrise photos because they allow you to achieve slower shutter speeds than you could normally get and create motion blur for a more compelling image.

What ND filter to use for waterfalls? ›

The most popular choice of ND I would recommend for waterfalls is a 3-stop (0.9) ND filter, although you can get much higher versions right up to the 10-stop (3.0) filters that will allow you to shoot well over thirty second exposures in the midday sun.

Should I use a polarizing filter for sunsets? ›

Use of a polarization filter for sunsets is also not necessary. It won't do any harm, so leaving the filter on you lens is possible. But be aware of bright sunlight. It can produce extra flares because of the extra glass in front of your lens.

Do you need ND filter for street photography? ›

Should they? For the vast majority of street photography work, a protective or UV filter is all you need. They preserve contrast and detail well.

What ND filter to use in bright sunlight? ›

A 3-stop or 0.9 density ND is ideal for waterfalls in bright sunlight, slowing the exposure to a second or so, depending on the f-stop and ISO used. A strong 10-stop or 3.0 ND filter can blur clouds over several minutes, even on a bright sunny day.

How do you shoot a sunset with an ND filter? ›

Using ND Filters for Extreme Long Exposures and Sunset Photography

What is the difference between an ND filter and a polarizing filter? ›

They work differently. Basically, a polarizer is used for blocking light reflected off a surface, while an ND just makes the whole scene darker. Polarizing filters can enhance the color of the image while ND filters just block the light entering the camera. It does not change the overall color of the image.

Videos

1. DJI Air 2S ND Filters - WHEN TO USE THEM
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2. DJI Mini 2 ND Filters - How I use Drone ND Filters
(Phillip Skraba)
3. DJI Air 2S ND Filters 😎 When & How To Use ND Filters 😜 4K Edition
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4. ND Filters Explained (Why & When To Use Them)
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5. ND Filters & 4 Reasons You Should Use Them (Practical Use)
(Bryan Auer)
6. Variable ND Filters – How, Why and When to Use Them For Video and Photography
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