How To Change F-Stop On Sony a7III In Manual Mode?

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If you want to adjust the brightness of the photo, you must change the f-stop or aperture value of the camera. The big question is: how do you adjust the f-stop on the Sony a7III? This article answers your question to help you capture high-quality images.

To change the f-stop on the Sony a7III, rotate the mode dial to Manual mode. After that, turn the front dial near the shutter button to adjust the aperture settings. 

However, when using Manual mode, you must also change both the shutter speed and ISO to achieve correct exposure. Below, we will teach you the detailed steps for adjusting f-stop on the Sony a7III. But first, we will cover the definition of aperture and the reasons to change it.

What Is Aperture In Photography?

What Is Aperture In Photography

The aperture describes the opening of the lens. It allows more or less light to pass through and reach the camera sensor, ultimately creating exposure.

The aperture functions like the human eye. Opening the aperture enables more light inside the sensor, while closing it limits the amount of light hitting the camera.

It can also affect the depth of field, which is the area in sharp focus within an image. A large aperture produces a shallow depth of field or a more noticeable background blur. Meanwhile, a small aperture has a deep depth of field.

The aperture value is expressed in f-stop or f-number. A small f-stop, such as f/1.8 or f/2.8, denotes a larger aperture. In contrast, a large f-number, like f/11 and f/16, has a small lens opening. It can be confusing at first because you might assume a large f-stop is a large aperture. However, the opposite is actually true.

Why Should You Adjust F-Stop On Your Camera?

There are many reasons to change the f-stop of your camera.

One of the most common reasons to adjust the f-stop is to control exposure. The aperture is part of the exposure triangle. It directly impacts the amount of light inside the sensor. As such, it can brighten or darken the photo, depending on your needs.

You can also let more light inside the sensor when you adjust the aperture setting. Choosing a small f-number can make the lens opening larger. It is ideal for low-light or night shooting. Still, you may wonder: can I just change the ISO speed to get a brighter image? Technically, yes, but doing that introduces a lot of digital noise in the image. That is why it is still better to adjust the f-stop to the desired value.

You can also change the aperture settings to achieve your desired depth of field or level of background blur. The background gives context to the subject. A large f-stop creates a blurred background that isolates the subject, making it ideal for portraiture and wildlife. Meanwhile, a small f-stop produces a deep depth of field perfect for architecture and landscapes.

There is also bokeh, which you can control by changing the f-stop on the camera settings menu. Bokeh describes the aesthetic quality of the out-of-focus areas in the photo. A small f-number (large aperture) creates a soft bokeh effect. On the other hand, a large f-stop (small aperture) ensures the subject stays sharp.

Finally, changing the f-stop gives you creative control over the image. You can choose a bright setting with a soft, blurred background or a dark, moody atmosphere with everything in focus.

How To Change F-Stop On Sony a7III In Manual Mode?

How To Change F-Stop On Sony a7III In Manual Mode

Changing the f-stop or aperture using the manual mode on the Sony a7III is fairly simple. Follow the steps below to achieve total control over the scene.

First, you must change the camera settings to manual. You can do that by rotating the mode dial on the top left of the camera. Turn the mode dial to manual exposure, which is depicted by the letter M.

Next, locate the control dial near the shutter button. It is situated on the grip and front part of the Sony a7III camera body.

Simply adjust the dial to change the f-stop or aperture value. Depending on your camera lens, you might get different aperture settings: f/2.8, f/3.2, f/3.5, f/4, f/4.5, and so on.

Remember that shooting in manual mode also requires you to change the shutter speed and ISO. If you simply focus on the aperture, you risk getting an image with incorrect exposure. Fortunately, setting the shutter and ISO speeds is easy. Spin the rear control dial on the right side of the screen to adjust the shutter speed. Then, press the left side of the control wheel where it says ISO to change the camera’s sensitivity to light.

What Is Another Way On How To Adjust F-Stop On Sony a7III?

If you are a beginner in photography, you might find the manual camera settings complicated and overwhelming. Fortunately, there is another way to adjust the f-stop or aperture without using the manual mode.

To start, rotate the mode dial on top of the Sony camera to the “A” setting. It stands for aperture priority mode. It lets you choose the f-stop manually, but it automatically sets the shutter speed and other camera’s settings to ensure proper exposure.

After switching to the aperture priority mode, you can freely adjust the f-stop on the Sony a7III camera. Use either the front control wheel (near the shutter button) or the rear dial to change aperture.

And that is it! You can now control the aperture without worrying about the correct shutter speed and ISO.

Frequently Asked Questions

What is the best f-stop for the Sony a7III?

The best f-stop number for the Sony a7III largely depends on the shot and effect you want to take.

For example, if you want to isolate the subject from the background, you can use a low f-number or a wide aperture. Set it to f/1.8 or f/2.8 to create a shallow depth of field and soft bokeh effect. You can also take advantage of the larger lens opening when shooting in dimly lit or low-light surroundings.

However, if you want to keep everything in the frame in sharp focus, set the f-stop to a higher number. Using f/8 or f/11 can produce a deep depth of field perfect for group photos, street shots, and landscapes. 

Can I change f-stop while recording video on Sony a7III?

Yes, you can adjust the f-stop number while filming a video on the Sony a7III. To start, turn the mode dial to Movie mode. Then, switch on the Exposure mode to change the aperture and other settings during video recording.

Remember that changing the aperture affects the exposure and depth of field of the video. If you do not want to get a darker or brighter video and a blurry background, keep the exposure consistent throughout filming.

How to reset the aperture settings to default on Sony a7III?

If you are not happy with the current aperture setting, you can revert it to default. Press the Menu button on the top left of the screen. Next, select the camera icon. Then, scroll down to the “reset default” option. Lastly, click “initialize” and “enter” to restart the camera. You can now shoot with a new f-stop setting.


The f-stop is a numerical value that describes the size of the lens aperture. It is a fundamental factor of exposure in photography, so learning how to change it is vital. 

You can change the f-stop on the Sony a7III by switching the camera shooting mode to manual or aperture priority. Then, use the front dial near the shutter button to adjust the aperture.

Do you have other questions about changing the f-stop on the Sony a7III? Send a message via our contact page, and we will get back to you soon!