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What Do Crop Factors Really Mean?

Phil Rhodes of RedShark News writes a post about what crop factors actually signify when it comes to creating an image.

He writes, “The biggest single problem I have with the proposed approach to lens evaluation is the reliance on crop factors – the practice of expressing the difference in field of view between two differently-sized sensors using the same lens as a multiplier of focal length. A smaller APS-C sensor, for instance, has a field of view similar to a full-frame 35mm sensor with a lens 1.6 times longer. This is, without doubt, a useful shorthand for experienced photographers used to the performance of lenses on full-frame cameras, but that’s all it is: a shorthand. I’ve frequently heard people talking about lenses on smaller-sensor cameras as if their absolute optical performance has changed, which is of course untrue.”

Read the full story here.

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