Then, using the filter holder system, you can add a 10 stop ND filter together with the ND hard grad, add some Lightroom and Photoshop trickery to it and you can get a shot like this.

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And there you go, ND filters explained. Don’t forget to check out the ‘How to use ND filters tutorial’, where I’ll be out in the field using them. You can also download the free Guide to ND filters via the link above.

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Screw on TypeOnes that screw onto the front of your lens, ones that need to use a filter holder system and graduated ND filters, with the graduated ND filters it’s best to use a filter holder system.

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An ND filter acts like sunglasses would to your eyes, it blocks light coming into the lens like sunglasses blocks light coming into your eyes. ND stands for Neutral Density which means it blocks the light in a neutral way without changing the colour of the light.

For long exposure shots like below with clear water and blurred clouds you will want a 6 stop or 10 stop ND filter as this will give you an exposure time of at least 30 seconds and up to 4 minutes. The higher stop filters will enable you to get those long exposures.

There are lots of different ND filters brands and kits out there. We want to recommend to you what we think are the best whether you are on a budget or not. We have only recommended companies that we or our colleagues use.

Hi, I’m Marc Newton and I’m a photographer, educational speaker, author, teacher of photography and the founder of The School of Photography. Follow my personal work on Facebook and Instagram.

A good sturdy tripod is a must. You’ll need a bit of weight so it holds your camera firmly and still for long periods of time.You will also need a cable release or remote trigger. This is so you can use your camera on a setting called bulb. I’ll teach you all about bulb in the next tutorial when I’m out and about. You can get these quite cheaply of the internet, just type in ‘cable release for …..your camera model.I also recommend you avoid variable ND filters. It’s harder to judge your exposure times with these types and on its strongest setting you can sometimes get lines going through the image. I would recommend getting a 10 stop and a 6 stop filter to get you started. You’ll have loads of fun with them.

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Light is good, right? It’s what makes the image. It makes sense to think that if you block light coming into your lens you’re just going to make a dark, underexposed image.Well, when you block light coming into your lens you’re are forced to expose the camera to light for a longer period of time. You have to open the shutter for longer to allow for the correct amount of light to enter the camera.

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The filter holder typeCons - A lot more expensive. This system is for a commitment to this type of photography, or for those who have the money to spare – the other is for a practice or play around.Pros - Better quality. You can use them with other lenses but you will need an adapter ring for different lens. You can use ND filters in conjunction with other filters like the ND grad filters.

There are many brands and they are all pretty good. Here are some brand names - HiTech, Lee, Nisi and cokin, the latter being the more budget brand.

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ND Grads are mainly used to darken down skies and balance out your exposure.Below is an example using a hard grad ND filter. The one on the left is a normal picture shot using the camera’s built in light meter. This is what the camera thought was the correct exposure. The one on the right with the 2 stop hard grad ND filter. This has darkened the sky by 2 stops to give a much more balanced exposure.

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Let’s look at them both together. The one on the left, shot at 1/30th of a second, the one on the right, shot at 30 seconds with a 10 stop ND filter on. Again, they have both been exposed to exactly the same amount of light, but with the ND filter on you able to let that light in slowly which allows moving things to blur, such as the clouds, and it also allows things to blend in, such as the ripples in the water. Also note that it is only the shutter speed that has changed. The aperture and ISO stay the same when you are doing these shots and you must shoot in fully manual mode. I cover that in much more detail in my other tutorial ‘How to use ND filters’.

Let’s look at the effect an ND filter can have on an image. Below is a normal picture with no filter, taken using a tripod at 1/30th of a second. You can see the ripples in the water and the clouds look clear, everything has been frozen for that fraction of a second. Exposure details - 1/30th sec, f22, ISO 400

ND filters are created in stops. A stop in photography is either halving or doubling the amount of light e.g. making the picture 1 stop darker or 1 stop lighter. In the case of ND filters, you are always halving or reducing the amount of light. So a 1 stop ND filter will be stopping the light by 50% or half. A 10 stop filter is stopping the light by 10 halves in a row. You have to do it sequentially, that’s important.Remember when you’re doing long exposure shots it’s only the shutter speed you want to be changing. If you have a 2 second exposure without a filter, then you put a 1 stop ND filter on, you have effectively halved the amount of light coming into that camera. So to counter balance this you have to increase the amount of time you let light into the camera, in this case by doubling it. See table below.

In this tutorial, I’m going to give you a guide to ND filters in photography; what ND filters do, what ND filters to buy, what effects they create and so on. I’ve also created an ND filters guide that you can download and keep. This will help you work out shutter speed times using our exposure calculator and advise on what ones to buy.If you’re thinking of buying or using ND filters to create long exposure effects, then this tutorial is for you.

Just to confuse you more, different manufacturers will advertise different numbers for stops. For instance, instead of saying a 2 stop ND filter, they might say it has an ‘optical density of 0.6’ or a ‘ND factor of 4’. To help you out with this here is another table giving you all these different numbers which mean the same thing.

That’s the basic principle of ND filters, they stop light coming into your camera which forces you to compensate by letting in light over a longer period of time. The table below shows this with a 1 second exposure adding different strengths of ND filters. Notice how the new exposure times double sequentially. E.g when you add a 4 stop ND filter you have to double the original exposure 4 times.

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If you want that glass looking effect in the water you need the water to be fairly still and calm, just slight ripples is perfect. Big crashing waves and rough seas will not work that well for this smooth glass effect. Also have a few clouds in the sky, this will give the shot texture. A fully overcast day will just give you a grey sky and although clear skies can look good a bit of texture up there adds to the shot. And try to catch the sunrise or sunset. Midday light will be too white and may even be too bright to get a 30 second or above exposure.

Then for shots like the one below you will want a 2 stop filter. This was shot at 1/15th of a second in the middle of the day. Because there was a lot a light I needed to stop the light down slightly so I could open my shutter for longer.

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The screw in types are very good value for money (around £10 or $15 each), you can get lots of different brands of these and they all do pretty much the same thing. If you’re just starting out I recommend getting one of these types that will fit your widest-angle lens or your standard zoom lens, this will be great for getting those long exposure landscape shots.

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And here is a shot taken just after that one using a 10 stop ND filter. The filter has allowed me to increase the exposure time to 30 seconds. I’ve still exposed the camera to same amount of light, but this one has been exposed over a longer period of time. When you do that everything that’s still, stays still, i.e. the tree and mountains and everything that moves blurs or blends together. This shot has also been adjusted in Lightroom to pump up the colours and contrast. Check out my other tutorial on how I adjust images in Lightroom if you wish. 30 Secs, f22, ISO 400