Full-frame vs APS-C: What actually changes when you upgrade?

A full-frame camera uses an image sensor that is equivalent in size to traditional 35mm film. Compared with APS-C (crop sensor) cameras, full-frame cameras can provide a wider field of view when using the same lens, greater control over background blur and improved low-light performance in some situations. The choice between one sensor type or the other depends on subject matter, workflow and shooting priorities.

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All digital cameras have one thing in common: a digital imaging sensor. But, not all sensors are the same. When it comes to Canon EOS mirrorless cameras there are two main image sensor sizes: the APS-C sensor (also known as a crop sensor), and the full-frame sensor.

What is a full-frame camera?

^{A full-frame sensor (left) has a larger surface area than APS-C (right), allowing it to capture more light. This can help improve low-light performance and create stronger background blur effects.}

What are examples of Canon APS-C and full-frame cameras today?

Canon's EOS R System includes both APS-C and full-frame cameras, each designed for different photography and video needs. APS-C cameras such as the EOS R7, EOS R10 and EOS R50 use a smaller sensor format, while full-frame cameras such as the EOS R8, EOS R6 Mark II and EOS R5 Mark II use a sensor equivalent in size to traditional 35mm film. The choice depends on subject matter, workflow and shooting priorities.

How does a full-frame sensor differ from an APS-C sensor?

The main difference is the physical size of the image sensor. A full-frame sensor is larger than an APS-C sensor, which affects the field of view captured by a lens and can influence background blur and low-light performance.

1. A full-frame sensor captures a wider portion of the image projected by the lens.
2. An APS-C sensor captures a narrower portion of that image.
3. This narrower capture area creates an additional reach.
4. The practical result depends on the camera, lens, subject distance and shooting conditions.

Making the switch from a crop sensor camera to a full-frame camera opens up a whole realm of new possibilities. You’ll be able to explore new shooting styles and experiment with genres of photography that were out of reach due to the limitations of a crop sensor camera system such as wider fields of view for landscape or architecture photography, better low light performance for events, faster autofocus for sports.

What are the benefits of a full-frame camera for video?

For videographers, the advantages are just as compelling. A full-frame sensor delivers cleaner footage in low-light environments, making it easier to capture high-quality video in challenging lighting conditions. Enhanced subject detection and autofocus performance provide more reliable focus tracking, even in dimly lit scenes, while the ability to achieve a shallower depth of field creates greater separation between your subject and background for a more cinematic, professional-looking result.
Important: APS-C and full-frame cameras are capable of producing high-quality images. Sensor size is only one factor influencing results, alongside lens choice, lighting, camera settings and photographer technique.

Why does a full-frame camera provide a wider field of view?

When using the same lens on these two different sensors you’ll end up with what appears to be a zoomed in image on the APS-C camera, and a wider field of view on the full-frame camera. This is because the APS-C sensor is physically smaller than a full-frame sensor which results in cropping part of the image that comes through the lens.

For example, using a 50mm lens on a full-frame camera will give you a true 50mm field of view.

On the other hand, when using the same lens on an APS-C sensor camera you need to multiply the focal length by a factor of 1.6x. This means your 50mm lens effectively turns into an 80mm lens on an APS-C sensor camera.

^{Compared to APS-C, a full-frame camera captures a broader field of view, helping you include more of the scene or subject in a single frame.}

Why does this matter?

A full-frame sensor can be particularly useful when you want a wider field of view to fit more in your image:

•   Landscapes
•   Architecture
•   Astro Photography
•   Interiors
•   Group portraits
•   Travel scenes

Conversely, the narrower field of view of an APS-C camera can be advantageous when photographing distant subjects. The crop factor effectively providing your lens more reach, it can be preferred when shooting:

•   Sports
•   Wildlife

The most suitable format depends on framing needs and subject distance.

Why do photographers choose full-frame cameras for background blur (bokeh)?

Full-frame sensors produce more background blur because they require a longer focal length or a closer distance to frame the same subject as a crop sensor which creates shallower depth of field.

The quantity and quality of blur you’ll achieve in your photos depends on the depth of field, which is linked to:

•   The distance of your camera to the subject
•   The focal length of your lens
•   The aperture of your lens

As a rule of thumb, the shallower your depth of field, the better your bokeh will be.

APS-C sensors not only multiply focal length of your length by 1.6x, but they also impact the maximum aperture of your lens in the same way. When mounted on a cropped sensor camera, your 50mm f/1.4 lens effectively behave closer to an 80mm f/2.8 lens.

^{Left: Full-frame: More background blur to help your subject stand out. Right: APS-C: Equivalent image with more of the scene in focus and greater detail in the background.}

Full-frame cameras enable you to stand closer to your subject and to leverage the full aperture of your lens. That’s the main reason why people jump to full-frame, their ability to create beautiful, soft, blurred backgrounds.

This comes in handy when shooting portraits, guiding your eye to the main subject where everything is sharp and the background is a creamy blur.

Pro Tip:
Don't just look behind your subject for bokeh opportunities. Shooting through foliage, fairy lights, flowers or other foreground elements can introduce beautiful out-of-focus blur in front of your subject, adding depth and a more cinematic feel to your images. Get creative with what's around you and use foreground blur to enhance the dreamy effect and draw attention to your subject.

Can a full-frame camera help in low-light photography?

A full-frame sensor can capture more light than a smaller APS-C sensor because of its larger surface area, which will give you cleaner images with less noise or grain when selecting higher ISO values.

^{Shot on EOS R8 Mark II
Capture cleaner, more detailed images in low light with a full-frame sensor.}

How does larger sensors improve photos in low-light conditions?

1. A larger sensor has a greater light-gathering area.
2. Cameras with similar pixel counts can use larger individual pixels.
3. Larger pixels can capture more light.
4. More captured light allows faster shutter speeds and lower ISO settings.
5. Images can be sharper and less grainy.

Canon's full-frame mirrorless cameras are designed to shoot in challenging lighting conditions with an ISO range of 100-40,000. The EOS R8 Mark II’s low-light auto focusing at EV-7.5 means greater low light auto focus performance in the mirrorless range.

What additional features are commonly found in full-frame cameras?

Sensor size is only one part of the equation. While all full-frame cameras share a larger sensor format, they can be designed for different types of photographers and creators.

Some full-frame cameras prioritise portability and simplicity for travel and everyday photography, while others include additional controls and workflow features for demanding photo and video productions.

Depending on the model, common features found in full-frame cameras can include:

•   In-Body Image Stabilisation (IBIS) for sharper and smoother handheld shooting
•   Larger and brighter electronic viewfinders
•   Longer battery life
•   Additional custom buttons and control dials
•   Advanced video recording formats and workflows
•   Enhanced weather resistance and durability

A common misconception is that moving to full-frame means carrying a large professional camera. Today, Canon's EOS R System includes compact full-frame models designed for travel and everyday photography, alongside advanced models built for demanding professional workflows.

When should you choose APS-C instead of full-frame?

Choosing between APS-C and full-frame is not simply a matter of selecting the larger sensor. The most suitable option depends on shooting style, subject matter, lens choice and workflow requirements. Both formats play an important role within Canon's EOS R System.

From lightweight APS-C cameras to advanced full-frame models, the Canon EOS R System is designed to support every stage of your creative journey. Explore the range to find the camera that matches your shooting style and ambitions.

Explore the EOS R System.