Sigma's DC mount, while designed for APS-C sized sensors does not do it in the same fashion as Canon's EF-S. The rear element of the Sigma DC is smaller, so if you put it on a 5D or new 1D, there would be portions of the sensor that would not receive any light. Canon on the other hand, sticks the rear element of EF-S lenses closer to the sensor, giving the mirror of your 10D something to slap as it flies by.
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Sigma's DC mount, while designed for APS-C sized sensors does not do it in the same fashion as Canon's EF-S. The rear element of the Sigma DC is smaller, so if you put it on a 5D or new 1D, there would be portions of the sensor that would not receive any light. Canon on the other hand, sticks the rear element of EF-S lenses closer to the sensor, giving the mirror of your 10D something to slap as it flies by.
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Found a fair deal on a 10D locally, but I wanted to make sure it fit the siggy first....