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Camera sensor size is the physical size of the sensor’s active image-forming area. It affects how much of a lens’s projected image is recorded—and therefore the field of view—but it does not, by itself, determine image quality.
What does camera sensor size mean?
A camera sensor converts incoming light into an image. Its size refers to the dimensions of the active area that records that image, usually given in millimetres or described by a format name such as full frame, APS-C or Micro Four Thirds.
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Format names are useful shorthand, not guarantees of one identical set of dimensions across every camera. In particular, APS-C sensors vary by manufacturer and model.
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| Format or example | Active-area dimensions | Diagonal or crop-factor context |
|---|---|---|
| Full frame | 24 × 36 mm, as defined by Canon Academy | Approximately 43.3 mm diagonal in Canon Academy’s comparison |
| APS-C example | 22.5 × 15 mm, in Canon Academy’s example | Approximately 27 mm diagonal and 1.6× crop factor in that example |
| Fujifilm APS-C X Series example | 23.5 × 15.6 mm, as listed by Fujifilm | Fujifilm gives a 1.5× conversion factor |
| Micro Four Thirds example | 18 × 13.5 mm, as listed by Fujifilm | Fujifilm gives a 2× conversion factor; the system FAQ describes the sensor diagonal as about half that of a 35-mm sensor |
These are source-specific format and product-family examples, not a promise that every sensor using the same format label has precisely the same active-area dimensions. Canon Academy’s and Fujifilm’s sources do not state publication years for these figures.
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What is crop factor and how do I calculate it?
Crop factor compares the diagonal of a reference sensor—usually full frame—with the diagonal of the sensor in question. In simplified form: crop factor = reference sensor diagonal ÷ the other sensor’s diagonal. The result depends on the dimensions used and on the stated reference format.
A smaller sensor records a smaller central portion of the circular image projected by a lens. With the same lens and camera position, it therefore captures a narrower field of view than a larger sensor. Nikon Australia explains this central-area crop, while Fujifilm describes field of view as the result of focal length and sensor format working together.
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“Equivalent focal length” is a way to express that field-of-view comparison against a reference format. It does not mean the lens’s physical focal length changes. For example, Nikon UK says the DX mirrorless bodies it describes have APS-C-sized 20.9-megapixel sensors and a 1.5× crop factor relative to full frame. That is a specific body-family example, not a universal figure for every APS-C camera.
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Field of view
Sensor format changes how much of the lens’s projected image is captured. This is why the same lens can show a narrower view on a smaller sensor, even though its focal length remains unchanged.
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Camera-system design
Sensor size is one factor in the design of a camera and its lenses. The Micro Four Thirds standard describes its aim as combining image quality with compactness and low weight through lenses designed for that format. That is a system-level design goal, not a guarantee that every smaller-format camera or lens will be lighter or better for every use.
Image quality
A larger sensor does not automatically produce a better photograph. Image quality also depends on resolution, pixel dimensions, lens performance, exposure, processing and the intended output. Canon notes that when total pixel counts are similar, a larger sensor can have physically larger pixels; that is one consideration, not a complete rule for judging image quality.
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How to compare sensor formats fairly
When comparing cameras or formats, keep these questions separate rather than treating the format name as a complete measure of performance:
- What are the sensor’s actual active-area dimensions and aspect ratio?
- What is its diagonal-based crop factor, and which reference format is being used?
- What field of view will the same focal-length lens record?
- How are the camera and lens systems designed in size, weight and intended use?
- What are the pixel count and other relevant image-quality factors, considered separately from sensor dimensions?
The Micro Four Thirds System FAQ describes the standard as “an extension of the Four Thirds System, optimized for mirrorless interchangeable lens cameras.”
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- 【How to use】Dispense 1-2 drop of cleaning fluid onto the edge of the swab, slightly swept it very carefully across the sensor at the appropriate angle, then reversed it and back.
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- 【Wide Usage】This camera sensor cleaning kit not only can clean the camera sensor, can also clean the edge of lens, mobile phone, monitor, lens, etc.
Sources
- Canon Academy glossary
- Fujifilm, “Focal Lengths Demystified”
- Micro Four Thirds System FAQ
- Nikon Australia, “What Is Crop Factor? How It Changes What Your Lens Does”
- Nikon UK, “What is crop factor and how do I calculate it? DX and FX explained”
- ZEISS, “Making Sense of Sensors – Full Frame vs. APS-C”
- Canon Canada, “Full-Frame Camera Benefits”
- Canon New Zealand, “Sensor Size Definition”
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