Sensor sizes currently have many possibilities, depending on their use, price point and desired portability. The relative size for many of these is shown below:
Canon's 1Ds/1DsMkII/5D and the Kodak DCS 14n are the most common full frame sensors. Canon cameras such as the 300D/350D/10D/20D all have a 1.6X crop factor, whereas Nikon cameras such as the D70(s)/D100 have a 1.5X crop factor. The above chart excludes the 1.3X crop factor, which is used in Canon's 1D series cameras.
Camera phones and other compact cameras use sensor sizes in the range of ~1/4" to 2/3". Olympus, Fuji and Kodak all teamed up to create a standard 4/3 system, which has a 2X crop factor compared to 35 mm film. Medium format and larger sensors exist, however these are far less common and currently prohibitively expensive. These will thus not be addressed here specifically, but the same principles still apply.
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