A Guide To Shotgun Microphones And Boom Poles For Filmmaking

Published:
Updated:

An essential part of video production and filmmaking is ensuring quality sound.

Regardless of the pictures, a project with poor-quality audio will be difficult to watch.

Unfortunately, in-camera microphones do not offer clear audio, so instead, we have to find other ways to record good audio.

There are many ways to collect audio, all applicable in different scenarios, from on-camera microphones to Lavaliers to condenser mics.

However, you will see a shotgun microphone on a boom pole on most film sets.

If you’ve struggled to record audio or are looking for a clearer sound for your filmmaking projects, this article will help explain how to do so with a shotgun microphone and a boom pole.

What Is A Shotgun Microphone?

133407111 s

A shotgun microphone is directional, meaning it picks up audio directly in front of it.

Because of these microphones’ long and cylindrical shape, they isolate audio in front of the microphone while minimizing other sounds from the size and the rear.

The narrow pickup pattern of shotgun microphones makes these microphones especially well-suited for capturing dialogue on set.

Within the category of shotgun microphones, there are still plenty of different things to consider.

Some variants of shotgun microphones include on-camera shotgun microphones, directional condenser shotgun microphones, and long shotgun microphones.

On-Camera Shotgun Microphones

Tripods

Perhaps the simplest shotgun microphones are on-camera microphones.

These microphones, such as the Rode VideoMic, are mounted on a camera’s hot shoe mount – or the cold shoe mount on your camera cage.

They have a 3.5mm jack that can plug into most cameras and often have settings to adjust the dB level.

For example, the Rode VideoMic has a low-frequency cut-off, designated by a diagonal line, and -10, 0, and +20 dB level settings.

A good on camera directional microphone can offer very usable audio for many situations, however, the distance to your subject is limited by the camera.

These shotgun microphones are so short, so they do not have a super tight pickup pattern. Especially if your subject is far away, you risk picking up extraneous noise.

Additionally, a 3.5mm input is less reliable than an XLR cable, and relying on your camera to adjust audio levels is dangerous.

Using a shotgun microphone with an audio recorder, such as the Zoom H4N, is much safer, and you can more easily take steps to avoid peaking. You can also place the mic closer to your subject.

Short Shotgun Microphones

114911470 s

The length of the shotgun microphone can play a big part in determining the directionality of the pickup pattern and the situations you may use your microphone.

Short shotgun mics are extremely common and include those mounted on cameras. These microphones are typically quite durable, and the small size makes them more portable.

Many short shotgun mics without on-camera microphones have XLR inputs and require phantom power from an audio recorder or mixer.

Buying audio adapters that can be mounted on your camera if desired is possible.

The pick-up pattern of short shotgun microphones is still very directional and more precise than lavalier and handheld microphones.

However, they are less directional than longer models, and though they can perform well at four feet away, you ideally want them closer to two feet.

Medium Shotgun Microphones

24544717 s

Medium shotgun microphones are often used in TV and film for booming and voice pickup.

These microphones also tend to require XLR input and external power.

The benefit of a longer microphone is a more directional pickup pattern and rejection of off-axis sound. They can be used from six feet away with minimal background noise, though they are best at around three.

A medium shotgun microphone is the safest bet for booming and recording voices.

They are still very directional. However, it remains easy to use and offers some leeway regarding placement.

Long Shotgun Microphones

2517712 s

Long shotgun microphones are best suited for exterior shots and have a tight pickup pattern.

Though you always want to keep your microphone as close to the subject as possible, using a long shotgun microphone from distances of around nine feet is possible as long as there isn’t too much noise outside.

Considering the tight pickup pattern, the boom operator must aim the microphone at the subject. If not paid attention to, changes in the microphone angle can be quite noticeable with a drop-off in audio.

With longer interfaces, a fixed mic or skilled boom operator is required. These microphones are super helpful for distant sounds and loud environments, but their sensitivity makes changes in placement noticeable.

Long shotgun microphones have more issues with reverberation indoors due to their tight range and high sensitivity.

Reverb is the remainder of the sound in the room after the source has ceased.

In rooms with high amounts of reverb, the on/off-axis sounds are quite similar and omnipresent, causing sensitive shotgun microphones to pick up on it.

Monitoring your audio and being cautious about hard surfaces and echoes is always necessary.

How To Use A Shotgun Microphone

103955378 s

You must consider several things when using a shotgun microphone that isn’t mounted on your camera.

Use an audio recorder

First is that you will need an audio recorder in addition to the microphone, and most likely an XLR cable.

A recorder such as the Zoom H4N Pro is a relatively inexpensive way to use an external microphone. It lets you monitor levels with headphones and adjust the sensitivity before recording.

After setting up your microphone and recorder, there still are a couple of things to consider.

Consider distance

The first thing to understand is that these microphones do not let you pick up conversations from long distances.

Depending on your microphone, you can get up to nine feet away and still have usable audio. However, that is pushing it and requires a very controlled environment.

Aim down

Instead, the best setup for these microphones is around three feet away from the subject and ideally pointed down.

By aiming the microphone at the subject’s head from above limits the chances you will pick up any background noise.

Because shotgun microphones are directional, they pick up what they’re aimed at, including anything behind them. Booming limits the audio collected to your subject and the ground beneath them.

In certain situations, you may need to position the microphone below or to the side of your subject. If this is done, monitor your audio before shooting to ensure you aren’t picking up any unwanted sound.

Also, avoid aiming the microphone at hard surfaces. As we covered, these microphones are very sensitive and can pick up reverb we may not hear naturally. Always monitor the audio.

Don’t move fast.

A final note is to avoid moving the microphone quickly. Shotgun microphones are sensitive and all too easily pick up handling noises.

These microphones can even get wind interference from sudden movements. Windscreens and shock mounts, discussed in the next section, can help.

Accessories For Your Shotgun Microphone

11111704 s

To get the most out of your shotgun microphone, there are some accessories you should strongly consider.

In addition to a field recorder and XLR cable, a windscreen, shock mount, and boom pole will help drastically.

Windscreens and blimps

Shotgun microphones are sensitive to wind and can even pick up sound from air-conditioning or vents in indoor locations.

To help reduce the problems with wind, you can acquire a windscreen to put over the microphone.

These can either take the form of a foam sleeve or a furry sock that goes over the microphone (also known as a dead cat).

There are also more expensive windscreens called “blimps,” which are hard cases that go around the microphone and can have a dead cat screen over them.

Blimps do well to protect your microphone and often come with a built-in shock mount.

Shock mount

A shock mount is used to help reduce the handling noise that a shotgun microphone may pick up.

These often use rubber fixtures to help minimize the shock of sudden movements and let the microphone float more freely.

Shock mounts can either take the form of a handle for you to hold or one that you slide into that attaches to a boom pole or camera if you’re mounting the microphone.

Making sure you can mount your microphone is extremely helpful, as shotgun microphones are not designed to be handheld.

How To Use A Boom Pole

103956143 s 1

The most popular method of mounting a shotgun microphone is using a boom pole.

Boom poles are extendable poles with a screw or shock mount at the end to affix the microphone.

If you want to buy a boom pole, read our guide Five Best Boom Poles For Your Budget.

The benefits of a boom pole are many, letting you position the microphone out of frame but still close to the subject, as well as letting you utilize a shock mount.

You can also twist the pole during a conversation to capture both the subjects’ dialogue. If you’re doing this, it’s a good idea to give the boom pole operator a copy of the script so they can follow along.

Some booms have an XLR cable built in that runs through the pole. However, that is unnecessary. It is just as easy to wrap an XLR cable around the outside of the boom pole.

How to Place a Boom Pole

80898269 s

When using a boom, there are some best practices to remember. These tips will help keep you from tiring out and let you get the cleanest audio.

As we mentioned before, first and foremost, you want to keep the microphone as close to the subject as possible, ideally two to three feet away.

Communicate with the camera operator or director to determine the best way.

It is also preferable to have the microphone positioned directly above your subject. This way, you will ensure you only pick up their voice and nothing behind them.

If you’re recording a two-person scene, you can put the microphone between the two and gently twist it between the two to pick up all the dialogue.

When holding the boom pole and microphone, holding the pole with both hands over your head or behind your head and resting on your shoulders is the easiest way to do so without getting too tired.

Having the boom pole run parallel to your shoulders is far easier than holding it out directly in front of you.

Working With A Crew

103955385 s

Ideally, if you’re recording audio with a shotgun microphone and boom pole, you’re working with a small crew. It’s best to have a designated boom operator and sound person if possible.

Monitoring levels as much as possible helps protect you from getting unusable audio.

When monitoring audio, do so with headphones whenever possible. This will let you hear any extra noise, such as airplanes, that might go unnoticed.

Doing this and setting the sensitivity on an audio recorder ensures you get the best audio.

When setting the sensitivity, try to have dialogue around -6 dB for more headroom. If the audio gets above 0 Db, it will be clipped and unusable.

If you can’t use a crew, you may need to be more generous with your levels.

Especially in an unscripted setting, your subject may become more animated or suddenly speak louder, so you must be ready for dynamic changes.

If you’re shooting by yourself or can’t afford to have a boom operator, mounting your boom pole on a C-Stand above your subjects is a potential workaround.

Just ensure it is secure and that the stand is sandbagged.

When To Use A Boom Pole And Shotgun Microphone

120722538 s

There are certain situations when using a boom pole, and a shotgun microphone is more useful than other audio recording methods.

The technicalities of these microphones make them well-suited for dialogue, yet certain factors may inhibit their usefulness.

Environment

If you’re trying to collect room tone or the sounds of an environment, the hyper-directional nature of these microphones can be more harmful than helpful.

These microphones are limited from the sides, so you may fail to capture your surroundings completely.

These microphones also can often pick up audio the human ear is unaware of, such as wind, cars, and planes. Due to their sensitivity, shotgun microphones are not great for outdoor shooting in high-wind situations.

Instead, difficult windy situations may be served better by lavalier microphones. But a shotgun microphone with a windscreen can be a valuable backup audio source.

This is also the case if you’re trying to have an extreme long shot where it is impossible to have a microphone near your subject or if your subjects are moving very quickly.

Keeping shotgun mics close to and pointed at your subjects is essential. If this can’t be achieved, then Lavalier microphones are a great alternative.

Production

If you’re using a small crew or shooting alone, shotgun microphones can be useful only in controlled and static settings.

A camera-mounted or Lavalier microphone is a better option if your subjects move.

Also, be careful of environmental restrictions. It may be intrusive if you are in a setting without space for a boom pole or large audio setup. On-camera microphones and lavaliers are more discreet.

The same goes for an interview with uncomfortable or sensitive subjects.

An entire audio crew may be overwhelming or intimidating. As a filmmaker, it is always helpful to understand the impact a crew may have on the environment.

Conclusion

Shotgun microphones are a ubiquitous method of recording audio for a reason. These microphones are extremely useful for picking up dialogue, and their directional nature limits background audio picked up.

With most of my independent productions, I use an on-camera shotgun microphone (the Rode VideoMic) with a Lavalier microphone.

I have used larger condenser shotgun mics on bigger productions, such as the Rode NTG2, which gave me a very impressive and rich sound.

If you’re shooting with a small crew, one of the first things I would recommend assigning people to help with is audio.

A boom pole operator and sound engineer monitoring levels can save you from discovering that all the audio you captured is unusable or wasn’t even captured.

All said and done, shotgun microphones are diverse, and their applications are just as much so. No matter the filmmaker or their budget, there is a shotgun microphone that will help you get the job done.

So, let us know in the comments if you shoot with a shotgun mic and which one.

Also, if you use any tips or tricks that weren’t mentioned above, please share them.

Otherwise, hopefully, this article helps you collect the best audio possible for your next filmmaking endeavor!


Author

    by
  • Cade Taylor

    Cade Taylor is a filmmaker and writer based out of Los Angeles. Originally from Seattle, he continues to work as the Outreach Coordinator for the Bigfoot Script Challenge, where he helps connect up-and-coming writers with industry professionals. When he’s not working on his own projects, helping out with Bigfoot, or covering desks, Cade loves to share what he knows with other filmmakers and promote great content.

Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.