Sensor Size

Sensor Size


  1. A measure of the physical dimensions of an image sensor in a digital camera or imaging device.
  2. An essential factor affecting image quality, field of view, and depth of field.

Comprehensive Explanation


The term “Sensor Size” is a critical component in the language of digital imaging, particularly in photography and videography. It refers to the physical dimensions of the image sensor, which is the component inside a camera responsible for capturing light and converting it into an electrical signal, thereby producing an image. Sensor size is pivotal in determining various attributes of image quality, including resolution, depth of field, and low-light performance.

Importance of Sensor Size

Image Quality

Larger sensors often produce higher-quality images as they can capture more light. The larger the sensor, the bigger each individual pixel, allowing for more light to be absorbed and, consequently, generating less noise.

Depth of Field

A larger sensor will usually provide a shallower depth of field, which means more pronounced bokeh (the aesthetic quality of out-of-focus areas in an image).

Low-Light Performance

Sensors with larger dimensions typically perform better in low-light conditions. This is because larger sensors can gather more light, making them ideal for challenging lighting situations.

Crop Factor

The size of the sensor affects the field of view of a camera, often expressed as a “crop factor” when compared to a full-frame sensor, which is roughly equivalent to a 35mm film size.

Common Types of Sensors

Full-Frame Sensors

Measuring approximately 36mm x 24mm, these are considered the gold standard in professional photography.

APS-C Sensors

These are smaller than full-frame sensors, usually measuring around 22mm x 15mm. They are commonly found in consumer DSLRs and mirrorless cameras.

Micro Four Thirds Sensors

Measuring around 17.3mm x 13mm, these sensors are even smaller and are usually found in compact system cameras.

Smartphone Sensors

These are the smallest types of sensors and vary significantly in size. Their small size often necessitates additional computational photography techniques to achieve high-quality images.

Considerations and Trade-offs

Portability vs. Quality

While larger sensors often yield better image quality, they also make for bulkier and heavier cameras. Conversely, smaller sensors enable more compact and lightweight devices but may compromise on image quality.


Larger sensors are generally more expensive to produce, making cameras with larger sensors more costly.

Lens Compatibility

The sensor size also affects the types of lenses that can be used with a camera. Larger sensors usually require larger, more expensive lenses.


Understanding sensor size is indispensable for both amateurs and professionals who are passionate about digital imaging. While larger sensors often provide better image quality, depth of field, and low-light performance, they also come with trade-offs such as increased size, weight, and cost. Therefore, choosing a camera with the appropriate sensor size should involve a consideration of various factors including intended use, budget, and portability requirements.

Sebastian Chase
Sebastian Chase

Sebasitan Chase is a mobile digital photographer who enjoys trying out new mobile technologies, and figuring out how to get them to deliver high-quality images with minimal effort.Join him on his mission to help mobile photographers create incredible images and videos with their new-age digital cameras, no matter the form that they may take.

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