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Old Friday 12th October 2018, 17:22   #7
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Join Date: Aug 2018
Location: Santa Cruz, CA
Posts: 336
This section of a wikipedia article has a great graphic illustrating a crop sensor vs a larger sensor using the same lens. It shows the idea of the image circle on the left that is where the sensor would be. An FX lens, for example, would be the red lines and a DX sensor would be the black dotted lines. If one is designing a lens for DX, clearly the lens could be a smaller because it does not need to project out to the red lines for the same focal length.
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