Different lenses yield greater creative possibilities. However, Micro Four Thirds cameras also tend to be slightly larger, heavier and more expensive than compact cameras.Ĭompared to most digital SLRs, the Micro Four Thirds system (body and lenses) is smaller and lighter. However, their sensors are smaller than full-frame or even APS-C systems. The small lenses do not allow the noise depth-of-field tradeoffs of larger lenses in other systems. Micro Four Thirds cameras use an electronic viewfinder. Resolutions and refresh speeds on these EVF displays were originally compared negatively to optical viewfinders, but today's EVF systems are faster, brighter and much higher resolution than the original displays. Original Micro Four Thirds cameras used a contrast-detection autofocus system, slower than the phase-detect autofocus that is standard on DSLRs. To this day most Micro Four Thirds cameras continue to use a contrast-based focusing system. Both systems today provide focusing speeds to rival or even surpass many current DSLRs.ĭrawing showing the relative sizes of sensors used in most current digital cameras, relative to a 35mm film frame Although some current models, such as the Olympus OM-D E-M1 Mark II, feature a hybrid phase-detect/contrast detect system, Panasonic Lumix cameras have continued to use a contrast-based system called DFD (Depth from Defocus). The image sensor of Four Thirds and MFT measures 18 mm × 13.5 mm (22.5 mm diagonal), with an imaging area of 17.3 mm × 13.0 mm (21.6 mm diagonal), comparable to the frame size of 110 film. 220 mm 2, is approximately 30% less than the APS-C sensors used in other manufacturers' DSLRs it is around 9 times larger than the 1/2.3" sensors typically used in compact digital cameras.
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