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I use one shot most the time, ai-servo scares me cause I am addicted to focus lock recomposing.
I doubt the larger sensor comes into it from a focus point of view, the lens lets in the same amount of light to the same focus system which is totally independent of the sensor.
A crop sensor though is usually higher pixel density so your effectively placing the image under higher magnification
+1 I think this makes sense.
I find overall image sharpness is more consistent on FF, more magnification on APSH increases tendency of image shift due to 'vibration' perhaps?
My work consists of a large variety in different scenarios, and I rotate over 10 L lenses mostly primes.
If I have to count on a shot to be sharp (right on) in a sudden instant, its the FF camera I will pickup with 'any' lens attached.