Choosing the right camera sensor size is an important decision for photographers of all levels. Each sensor size has its own set of advantages and limitations, and the right choice depends on the type of photography you want to do and your personal preferences. This article will provide an overview of the most common camera sensor sizes and their characteristics, to help you make an informed decision when choosing a camera. 

Full-frame sensors 

Full-frame sensors, as the name suggests, are approximately the same size as a 35mm film frame, measuring around 36mm x 24mm. They are the largest sensors found in consumer cameras and offer several advantages over smaller sensors. 

One of the main advantages of full-frame sensors is their ability to provide a wide dynamic range and low noise levels, especially at higher ISO settings. This is because they have larger pixels than smaller sensors, which allows them to capture more light and produce less noise. 

Full-frame sensors also offer a wider range of lens options as they have a larger image circle than smaller sensors. This means that lenses designed for full-frame cameras can be used on full-frame sensors without any vignetting (dark corners) and with minimal distortion. 

Another advantage of full-frame sensors is their ability to produce more shallow depth of field (more bokeh effect), which is particularly useful for portrait and landscape photography. 

Overall, full-frame sensors are found in high-end DSLR and mirrorless cameras and are considered the best option for professional photographers, as they offer the highest image quality and the most flexibility in terms of lens options 

APS-C sensors 

APS-C sensors are smaller than full-frame sensors, measuring around 22.5mm x 15mm. They are found in many consumer and prosumer DSLR and mirrorless cameras. 

One of the main characteristics of APS-C sensors is the crop factor, which is a term used to describe the difference in field of view between the sensor and a full-frame sensor. The crop factor for APS-C sensors is typically 1.5x-1.6x, which means that lenses will have a longer effective focal length on cameras with APS-C sensors. For example, a 50mm lens on an APS-C camera will behave like a 75mm-80mm lens on a full-frame camera. This can be useful for certain types of photography, such as wildlife and sports, where a longer focal length is desired. 

APS-C sensors are also more affordable than full-frame sensors and are typically found in more affordable camera models, making them more accessible to a wider range of users. They are also more compact in size, making the camera body smaller and easier to carry around. 

However, APS-C sensors do have some limitations compared to full-frame sensors. They have smaller pixels than full-frame sensors, which can result in increased noise at higher ISO settings. They also have a smaller image circle, which means that lenses designed for full-frame cameras may not work as well on APS-C sensors. 

On the whole, APS-C sensors are a suitable compromise between image quality and affordability, and are a popular choice for many photographers. 

Micro Four Thirds sensors 

Micro Four Thirds sensors are a type of sensor found in mirrorless cameras and are even smaller than APS-C sensors, measuring around 17.3mm x 13mm. They have a crop factor of 2x, which means that lenses will have an even longer effective focal length on cameras with Micro Four Thirds sensors. For example, a 50mm lens on a Micro Four Thirds camera will behave like a 100mm lens on a full-frame camera. 

One of the main advantages of Micro Four Thirds sensors is their compact size, which allows for smaller and more portable camera bodies. This makes them a popular choice for travel and street photography, as well as for photographers who want a compact camera that can still produce high-quality images. 

Micro Four Thirds sensors also have a wide range of lens options available. This is because there are many manufacturers that produce lenses for Micro Four Thirds cameras, including Olympus and Panasonic. They are also compatible with lenses from other systems through adapters. 

However, Micro Four Thirds sensors do have some limitations compared to larger sensors. They have smaller pixels than APS-C and full-frame sensors, which can result in increased noise at higher ISO settings. They also have a smaller image circle, which means that lenses designed for full-frame cameras may not work as well on Micro Four Thirds sensors. 

Micro Four Thirds sensors are a reliable option for photographers who prioritize portability and have a wide range of lens options. They are also a popular choice for videographers as well. 

1-inch sensors 

1-inch sensors are similar in size to those found in point-and-shoot cameras and measure around 13.2mm x 8.8mm. They are found in some high-end compact cameras, also known as "premium compacts" or "advanced compacts" and bridge cameras, which are cameras that sit between point-and-shoot and mirrorless/DSLR cameras. 

One of the main advantages of 1-inch sensors is that they are larger than the sensors found in most point-and-shoot cameras, which allows them to capture more light and produce higher image quality. They also have larger pixels than smaller sensors, which can help to reduce noise at higher ISO settings. 

1-inch sensors also provide a wider range of lens options than smaller sensors, as they have a larger image circle. This allows for more flexibility in terms of lens selection, and can be useful for photographers who want a compact camera that can still produce high-quality images. 

However, 1-inch sensors are still smaller than APS-C and full-frame sensors and thus may not provide the same level of image quality. They also tend to have a smaller dynamic range and a less shallow depth of field. 

Overall, 1-inch sensors are a viable option for photographers who prioritize portability but still require a camera that can produce high-quality images. They are also a popular choice for people who want a compact camera but also want more control over their settings and a more versatile lens selection. 

1/2.3-inch sensors 

1/2.3-inch sensors are the smallest sensors found in consumer cameras and measure around 6.17mm x 4.55mm. They are found in most point-and-shoot cameras, as well as smartphone cameras. 

One of the main advantages of 1/2.3-inch sensors is their small size, which allows for compact and portable camera designs. This makes them a popular choice for people who want a camera that is easy to carry around and convenient to use. 

1/2.3-inch sensors also have a wide range of lens options available, as many manufacturers produce point-and-shoot cameras with this sensor size. They also have a wide range of ISO sensitivity which means they can take pictures in low light. 

However, 1/2.3-inch sensors do have some limitations compared to larger sensors. They have smaller pixels than larger sensors, which can result in increased noise at higher ISO settings. They also have a smaller image circle, which means that lenses designed for larger sensors may not work as well on 1/2.3-inch sensors. 

1/2.3-inch sensors are a good option for photographers who prioritize portability and convenience. They are also a popular choice for people who want a compact camera that can still produce decent images. However, they don't need the highest image quality or the most flexibility in terms of lens options. 

Other sensor sizes 

Other than the sensor sizes I have previously mentioned, there are two other types of sensors that are less common but worth mentioning: 

• Medium format sensors: These sensors are larger than full-frame sensors, usually measuring around 44mm x 33mm. They are found in specialized cameras such as Hasselblad and Phase One, and are used primarily for professional photography, such as fashion, landscape, and fine art. They offer the highest image quality and the most flexibility in terms of lens options. They also have a wider dynamic range and a shallower depth of field than smaller sensors. However, medium format cameras and lenses are typically more expensive and less portable than smaller cameras. 

• Large format sensors: These sensors are even larger than medium format sensors, typically measuring around 4x5 inches. They are found in specialized cameras such as view cameras and are used primarily for architectural and product photography. They offer the highest level of image quality and the most flexibility in terms of lens options. They also have a wider dynamic range and a shallower depth of field than smaller sensors. However, like medium format cameras, large format cameras and lenses are typically more expensive and less portable than smaller cameras. 

Overall, medium format and large format sensors are specialized options for professional photographers who require the highest level of image quality and the most flexibility in terms of lens options. They are also popular among photographers who want to create a unique look and feel in their work. 

Keep in mind that sensor size is just one aspect of a camera's image quality. Other factors such as lens quality, image processing, and noise reduction also play a significant role. 

In conclusion, camera sensor size is an important aspect to consider when choosing a camera. Full-frame sensors offer the highest image quality and the most flexibility in terms of lens options, while APS-C and Micro Four Thirds sensors are a reasonable compromise between image quality and affordability. 1-inch and 1/2.3-inch sensors are a good option for photographers who prioritise portability and convenience. Medium format and large format sensors are specialised options for professional photographers who require the highest level of image quality and the most flexibility in terms of lens options. Ultimately, the right sensor size for you depends on your specific photography needs and preferences. 

Regarding the feature image of this article, I didnt have a photo of my sensor so picked a photo taken on my Sony A7iii, a full frame camera.