The primary difference between a full frame and crop sensors is simply the physical size of the sensor. Full frame sensors are 35mm x 24mm while crop sensors are smaller than this and can vary in dimensions. Sensors come in several sizes, have varying characteristics and wildly differing prices.

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A Four-Fold Accumulator is one bet made up of four selections in different events. If they all win, so do you. But if any of the selections lose, your bet does too.