Originally Posted by Kayaker72
The body is allowing the 135 to operate at f/2 instead of f/1.2, and making the 135 pixels much bigger.
The CA is the fault of the lens, but using a crop body causes the CA to be magnified as compared to FF. On the other hand, lateral CA will show up more on the edges, which are cropped from the FF.
This is strange. In theory all things being equal there should be no difference in noise between FF and crop in this comparison. The 7D has a slightly less noisy sensor (less read noise), so I would have been sure the 7D would come out slightly ahead. Of course John is using ISO 200 instead of ISO160, but I still would have thought the difference between 5D and 7D to be almost zero.
Perhaps the difference has more to do with metering than anything else. To compare photon noise fairly, ISO isn't so important, but both cameras should have the same shutter speed (and ISO should be set to expose reasonably), so perhaps manual mode is best. John- were the shutter speeds similar?
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