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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 the camera records—and therefore the field of view—but it does not by itself determine image quality.
What camera sensor size measures
A digital camera sensor converts light into an image. Sensor size refers to the dimensions of the area that records that image, usually given in millimetres or described with a format name such as full frame, APS-C, or Micro Four Thirds.
Format names are useful shorthand, not guarantees of one exact measurement. In particular, APS-C sensors vary between manufacturers and camera models.
How common sensor formats compare
| Format or example | Dimensions or description | What the figure means |
|---|---|---|
| Full frame | 24 × 36 mm | Canon Academy’s definition, tied to the 35 mm still-camera frame. Canon Academy glossary |
| APS-C example | 22.5 × 15 mm | One Canon Academy example; it is not a universal APS-C dimension. Canon Academy glossary |
| APS-C X Series example | 23.5 × 15.6 mm | FUJIFILM’s stated X Series sensor dimensions; the company gives a 1.5× conversion factor. FUJIFILM |
| Micro Four Thirds example | 18 × 13.5 mm | FUJIFILM’s format example; it gives a 2× conversion factor. FUJIFILM |
| Micro Four Thirds format description | “4/3-type”; diagonal about half that of a 35 mm sensor | The system FAQ’s description. The format label should not be read as a promise that every camera has precisely identical active-area dimensions. Micro Four Thirds System FAQ |
ZEISS also cautions that APS-C digital sensor dimensions vary by manufacturer. For an individual camera, its published specifications are more useful than assuming the format label gives an exact measurement. ZEISS: Making Sense of Sensors
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What crop factor means—and how to calculate it
Crop factor compares the diagonal of a reference sensor, commonly full frame, with the diagonal of the sensor being considered. For example, Canon Academy’s 24 × 36 mm full-frame dimensions have an approximate diagonal of 43.3 mm; its 22.5 × 15 mm APS-C example has an approximate diagonal of 27 mm. Dividing the reference diagonal by the smaller one gives about 1.6× for that example.
Nikon UK gives another model-family example: its three DX mirrorless bodies use APS-C-sized 20.9-megapixel sensors with a 1.5× crop factor relative to full frame. Neither example establishes one crop factor or sensor dimension for every camera called APS-C. Nikon UK: What is crop factor and how do I calculate it?
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Why the view looks cropped
A lens projects an image circle. A smaller sensor records a smaller central portion of that image, so with the same lens and camera position it captures a narrower field of view than a larger sensor. The lens’s physical focal length does not change.
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“Equivalent focal length” is shorthand for comparing field of view across formats. For example, a 50 mm lens on a camera with a 1.5× crop factor gives a field of view comparable to a 75 mm lens on full frame (50 × 1.5), but the lens remains a 50 mm lens. The comparison concerns framing, not a physical change in the lens. Nikon Australia: What Is Crop Factor? FUJIFILM: Focal Lengths Demystified
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What sensor size changes—and what it does not
Sensor format is useful for anticipating field of view and understanding camera-system design. Micro Four Thirds, for instance, describes its system as an extension of Four Thirds optimized for mirrorless interchangeable-lens cameras. Its FAQ says the system aims to combine image quality with compactness and low weight through lenses designed for the format. That is a system design goal, not a guarantee that every camera or lens in a smaller format will be lighter or better for a particular use. Micro Four Thirds System FAQ
A larger sensor does not automatically produce a better picture. 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 comparison alone is not a complete image-quality rule. Canon Canada: Full-Frame Camera Benefits
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- Memory Support: Works with Class 10 SD, SDHC, or SDXC cards up to 512GB
- Rechargeable Battery: Included LB-012 lithium-ion battery charges in the camera over USB with the supplied adapter in about 2 hours; charge it for at least 4 hours before first use to maximize battery life
How to compare sensors for a camera you are considering
Keep these factors separate rather than using the format name as a substitute for every specification:
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Quick Recap
- Active-area dimensions and aspect ratio: check the camera’s specifications when exact dimensions matter.
- Crop factor: identify the reference format and compare sensor diagonals; do not assume every APS-C camera shares one exact value.
- Field of view: compare the framing a lens gives on each format, remembering that crop-factor equivalence does not change physical focal length.
- System design: consider the actual camera and lens sizes, weights, and intended uses rather than inferring them from sensor size alone.
- Image-quality factors: evaluate resolution, pixel dimensions, optics, exposure, and processing alongside sensor dimensions.
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