When it comes to camera lenses and sensors, bigger sensors require bigger lenses. At a full 24x36mm in size (the same as on a 35mm film camera or a full frame dSLR), one needs a lot of glass in order to cover the imaging circle in order to prevent a tunnel effect from not enough light falling on the sensor. Compounding the problem is that, when designing lenses to match sensors, size has to increase by the area squared. Example: a full frame digital sensor (24x36mm) is 864 sq. mm. In contrast, a 1.5x crop APS-C sensor (18x24mm) is only 432 sq. mm, exactly half the square area of the FF chip. For lenses. The implication is simple: any lens of a given focal length must be twice as large in...
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