In this guide, you’ll find all the fundamentals of aperture in photography, and it’ll help you understand what is aperture in photography and how aperture affects your photographs.
- What is aperture in photography
- What are the F-stop numbers in aperture?
- Aperture and exposure
- Aperture and depth of field
- Aperture and sharpness
- What is the best aperture in photography?
- Aperture photography examples
What is aperture in photography?
Aperture in photography is the opening of the camera lens, which is related to the amount of light that passes through the camera lens to the image sensor.
The aperture mechanism in the lens that allows more or less light to come in, is formed by a series of opaque “blades” called diaphragm. When the blades are open, your camera sensor will capture more light, whereas as the blades progressively close down, less light will hit your sensor.
What are the F-stop numbers in aperture?
The F-stop number (or focal-stop number) is a reference of how open or how close is the aperture in your camera lens.
In aperture and photography, the most common F-stop values follow a sequence like this:
f/1.4, f/2, f/2.8, f/4, f/5.6, f/8,f/11, f/16, f/22
The maximum and minimum aperture number or F-stop value varies from lens to lens, and you’ll set the specific value in your lens/camera in order to determine the desired aperture according to your goals.
Increasing/decreasing the F-Stop number will be related to opening up or closing (also called stopping) down your aperture.
What is a Large and a small aperture?
A large aperture is a wide opening of the lens, which allows capturing more light. This is also called a low ranging since it’s related to low F-stop values, usually ranging from f/1.4 to f/4.
When you use the largest aperture in your lens, you will be using a “wide-open” aperture.
A small aperture is the opposite, a narrow opening of the lens blades that don’t allow the passage of much light. It’s also called a high aperture, since the F-stop values related to it, ranging from f16 to f22.
When you use the smallest aperture in your lens, you will be using a “stopped down” aperture.
It’s important to understand and be familiar with these terms. Below, we’ll dive into the practical uses of aperture in photography, and you’ll constantly see the different scenarios and results of shooting using different aperture values.
How Aperture and exposure are related
As we anticipated in the introduction, aperture affects exposure and plays a fundamental role in determining, along with the ISO and the shutter speed, which is the optimal exposure in an image.
Considering a fixed ISO and shutter speed, the wider the aperture (or lower F-values), the brighter your image will be, and the narrower your aperture (higher F-values), the darker it’ll be. Large apertures are also known as fast apertures since they allow to decrease the exposure time, and small apertures are also known as slow apertures, since they allow to increase the shutter speed.
This is the most important aspect of aperture in photography. Depending on what you want to capture, there are certain scenes where you shouldn’t change your ISO and shutter speed, and aperture will be the key to have a proper exposure.
Understanding Aperture and Depth of field in photography
The depth of field is the proportion of the image that is reasonably sharp and in focus.
According to the physics laws in optics, the larger the aperture you use, the shallower depth of field you’ll be able to capture, having more areas of your images out of focus, and less sharp.
Conversely, the smaller aperture you use, the greater depth of field you’ll see in your image, having a bigger proportion in focus.
The aperture and depth of field that you’ve to look for, depend mostly on:
- The scene that you’re photographing
The type of scene that you want to capture will usually dictate if you require less or more depth of field.
For instance, if you’re photographing landscapes, you’ll probably aim at having as much proportion of the image in focus as possible, whereas if you’re shooting portraits, your goal can be having a blurred background, so all the attention goes to the subject.
- Your artistic view
From an artistic point of view, there is no rule to determine the depth of field and aperture in your image.
For example, you can intentionally leave the foreground of your landscape out of focus to lead the viewer’s eye to the background. Or, in a portrait, shoot everything in focus because the background says something important.
Aperture and sharpness in your photographs
Another crucial factor beyond the exposure and depth of field is how aperture affects sharpness in photography.
Using extreme aperture values in photography is not recommended. When you use a very large aperture, your lens can’t physically produce the sharpest results, since the diaphragm will be wide-open, trying to capture as much light as possible.
That way, as you open your aperture below f/5.6 values, you’ll be able to notice how your image loses sharpness.
Aperture and diffraction
The same happens when you set a small aperture. In that case, there is a phenomenon related to aperture in photography called diffraction, which is an optical effect that results in less quality throughout the image. You can see this phenomenon as you start closing the aperture above f/16 values.
Which is the sharpest aperture?
There is no rule of thumb to know which is the sharpest aperture in a lens, since this varies depending on the lens model.
However, the sharpest aperture is always close to the also known as the lens “sweet spot”, that is, the aperture or F-stop value that produces the highest quality in terms of sharpness.
To calculate this sweet spot roughly, move two to three F-stop values from the maximum aperture of your lens. For example, if the maximum aperture in your lens is f/4, this would be between f/8 and f/11 → f/1.4, f/2, f/2.8, f/4,f/5.6, f/8, f/11, f/13, f/16, f/22.
I recommend testing your lens shooting the same scene using different aperture values, and comparing zooming in the details to see which produces the sharpest results.
How to set the aperture in camera
Learning how to set the aperture in camera is one of the key things when you start using the manual mode.
Before digital photography, the aperture was manually set on the lens, selecting the specific F-value.
This changed in digital cameras and, today, you can set the aperture in your digital camera electronically using the aperture button when you operate your camera in manual mode. There are still some manual lenses that require to set the aperture manually, but all the electronic lenses compatible with your digital camera will allow you to choose your aperture easily.
The button to adjust aperture depends on the camera model. Since aperture is one of the basics in photography, it’s usually located in an easily-reachable place in the camera.
In most of the camera brands, you can set the aperture moving the wheel dial located on the front right top.
Aperture mode VS. Shutter mode
You can also make your camera choose automatically, which is the best aperture for each situation through the shutter mode (S). This semi-automatic mode can be useful if you know which shutter speed you want in advance. For example, if you know that for shooting a flying bird, you need at least 1/2000 of a second, you can set this parameter and the shutter mode will decide which is the best aperture.
Which aperture is best? Bigger Vs. smaller aperture
One of the most common questions in photography is which is the best aperture; Shall I use a big or a small aperture?
As we commented before, there is no black and white, and this will depend both on the type of photography that you’re taking and on your artistic goals.
However, and just as a reference, below, you’ll find a list with the most common and best apertures used across different photography genres.
Leaving different artistic choices aside, the best aperture in landscape photography is the one that allows you to have as much area of the image in focus.
As commented before, you can achieve this result by using the “sweet spot” aperture in your lens. In most of the landscape photography lenses, this will be between F8 and F11.
There are some specific cases that you should also consider:
Best Apertures in landscape photography
- f/1.4 – f/4: Best aperture for landscape aerial photography.
- f/8 – f/13: Best aperture for general landscape photography.
- f/13 – f/16: Best aperture when you need more depth of field or when you want to decrease the shutter speed without lens filters.
The best aperture for low light conditions will be different, since you’ll need to capture more light and, therefore, use a wider aperture.
Generally, the best aperture in night photography goes from the max. aperture setting on your lens like f/1.4-f/2.8 to small f-stop values like f/5.6.
Aperture in Milky Way Photography
To shoot the Milky Way, you’ll need to capture as much light as possible, since increasing the ISO over the limits of your camera will result in noise in photography and increasing the exposure time will turn the stars into trails instead of sharp spots.
For that reason, the best Aperture in Milky Way photography is always the largest possible according to your lens. You can read more in this article about Aperture and settings for Milky Way photography.
Aperture in full moon photography
In some cases, when there’s a full moon illuminating the landscape, you can close down your aperture to higher F-values like f/5.6 – f/8. That way, you’ll have more depth of field and a sharper image
Aperture in Northern Lights photography
Photographing the Northern Lights requires to push your camera to the limit, since you’ll be shooting in extreme low light conditions, and the shutter speed to freeze the movement of the Aurora must be very short (just a few seconds).
According to this, the best aperture in Northern Lights photography will also be the widest possible. You can find more in-depth info on this article on aperture and settings for Northern Lights photography.
Unlike landscapes, when you’re shooting portraits, there is usually one (or several) subjects that stand out from the other elements in the frame.
The best aperture in portrait photography to emphasize the subject is wide apertures, usually between the max. allowed by your lens like f/2.8 and f/5.6.
The goal, more than capturing light, is using the shallow depth of field to focus just on the subject, leaving blurred the other elements of the image.
This also depends on the lens and type of portrait. For example, if you’re using a long focal length like 50 mm or 85 mm with a wide-open aperture like f/2.8, getting too close to the subject will result in having areas of the subject out of focus.
This blurred effect caused by the aperture is also called as Bokeh in portrait photography. The faster the lens and the larger the aperture, the stronger will be the bokeh and the more will stand out your subject.
In sports photography, the subjects are usually moving at high speed, so the goal is to freeze their movement.
According to this, the best aperture in sports photography is commonly a large aperture, in values between f/2.8 and f/5.6.
Sometimes and, depending on the scene and the focal length, you might need a larger depth of field, and for this you’ll have to set narrower apertures like f/8.
Similar to the previous case, the best aperture in wildlife photography is a fast aperture that allows you to freeze the movement of the animal. This, of course, will depend on the animal and scene that you’re photographing.
The best aperture in bird photography will always be the maximum allowed by your lens. If, for instance, you’re shooting several animals at a far distance and they’re moving slow, you can use a slower aperture from f/5.6 to f/8.
Other effects of Aperture in photography
Beyond all the aperture effects on exposure, depth of field and sharpness that we’ve already seen, there are other interesting and side effects of using different apertures in some light situations.
Aperture for Sunstars and Moonstars
To create the visual effect of a sunstar/sunburst or a moonstar, you’ll have to close down your aperture to high F-Stop values from f/16 to the smallest aperture in your lens. That way, the sun/moon beams will be sharper.
This aperture effect also depends on the number of blades on the aperture of your lens. Lenses with an odd number of blades will capture the double number of beams.
Aperture and Dust spots in your images
Apart from the optical effect of diffraction already mentioned, using small apertures from f/13 to f/22 will make more noticeable the dust spots in your camera sensor. Following this, there is an effect of aperture on capturing the dirt of the sensor.
Aperture photography examples
To better understand what is aperture in photography and how aperture in photography works, you can check the examples below where there are images taken using different aperture values.
Small Aperture in photography examples:
Medium aperture in photography examples:
Large Aperture in photography examples:
Aperture in photography F.A.Q
Below you’ll find the response to some of the most common questions for understanding aperture in photography:
Aperture is the opening of the lens that allows the light to pass through the lens to the camera sensor.
F-stop numbers are a scale to reference how open or how close is the aperture.
The scale usually follows this sequence: f/1.4, f/2, f/2.8, f/4,f/5.6, f/8, f/11, f/16, f/22
Aperture affects mainly to the general exposure of the image, to the depth of field, and to the sharpness of the elements in the image.
A large aperture is a wide opening, which allows more light to pass through and captures a shallower depth of field.
A small aperture is a narrow opening, which blocks more light from hitting the sensor and captures a greater depth of field.
The largest and smallest aperture depends on the camera lens. They usually range from f/1.4 to f/22.
When the lens is “stopped down“, it means that you’re using the smallest aperture in your lens.
When the lens is “wide open“, it means that you’re using the largest aperture in your lens.
The use of a higher or lower aperture depends both on the type of photography and your goals.
Lower apertures (small F-stop values) will result in less depth of field and sharpness but will allow you to capture more light.
Higher apertures (high F-stop values) will result in more depth of field and sharpness (until a certain point), and will allow you to block more light.
The sharpest aperture depends on the lens. This is usually calculated taking the largest aperture, and setting two to three F-stop values to the right. For ex., in a lens with a max. aperture of F4, this would be between f/8 and f/11 → f/4, f/5.6, f/8,f/11, f/16…
The best aperture in low light is the widest aperture in your lens, that is, from f/1.4 to f/4.
The best aperture in street photography depends on the scene, but it generally ranges from f/2.8 to f/8 depending on the moving subjects.
Beyond reading the theory and checking the aperture examples, the best way to really understand what is aperture in photography is by practicing.
Practice shooting scenes with different light and different aperture values, and zoom in the images later to see how the exposure and the depth of field change, the two main effects of aperture in photography.
To complete your understanding of aperture and exposure, I suggest checking our articles about the other two basics in photography:
Also, you need to understand the next concepts:
I hope this guide to aperture in photography helps increase your knowledge about this important topic and especially, helps you shoot wonderful images!