Model Lines
Some cameras come in several colours, indicated by a suffix letter: K is black, S silver, A blue, R red, W white. Most lower-price cameras have small sensors of about 10.2 mm / 1/2.5". More expensive ones often have sensors of about twice the area, 14.1 mm to 15.4 mm / 1/1.65" to 1/1.8". dSLRs and Micro Four Thirds cameras have much larger sensors. Larger sensors produce a better signal-to-image-noise ratio and better dynamic range. The GH series of Micro Four Thirds cameras have a unique "multi-aspect" sensor, that is larger than the lens image circle. This allows use of three different aspect ratios, 4:3, 3:2 and 16:9, to be used natively. As a result, the image diagonal remains the same in all three aspect ratios and provides full coverage of the sensor and a larger field of view with higher resolution than one would get by simply cropping the 4:3 aspect to the narrower ratios.
Read more about this topic: Lumix
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