Summary
The Micro Four Thirds system uses a Four Thirds sensor, which measures 17.3mm x 13mm and has an aspect ratio of 4:3, compared to the 3:2 ratio of full-frame and APS-C sensors.
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The width of the sensor is 1.33x larger than the height, providing 4:3 format images.
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The sensor size is comparable to the frame size of 110 film
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and is significantly smaller than APS-C sensors.
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The main result of the different sensor sizes is seen in their relative fields of view, otherwise known as a crop factor.
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Pixel size is not fixed, with APS-C cameras tending to have smaller pixels.
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Micro 4/3 cameras not only benefit from smaller lenses than APS-C cameras, but also have the ability to use many brands of lenses outside of the standard Olympus and Panasonic lenses.
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The pros of micro four thirds cameras include a 4:3 aspect ratio better suited for printing photos at standard medium format sizes, and the ability to use a wide range of third-party lenses.
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The best portable travel camera has a 1-inch Type sensor size, which optimizes portability and captures excellent dynamic range.
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