Stoffer wrote:
I would still be surprised if the Sony 90mm Macro can't outresolve the 24 MP sensor in the A7III. The copy of that lens has to be pretty terrible for that to be the case, right? Or what am I missing here?
With all respect, what you are missing is System MTF = Lens MTF X camera MTF. (You can substitute resolution or sharpness for MTF if you like.) The key thing it's multiplicative. Basically unless you use a bottle for a lens or a 2 Megapixel camera, where one or the other is near zero, there is no "outresolve".
You can measure them scientifically (a made-up 'megapixels of resolution number' is not science, it's marketing). So if camera measures 0.6 and lens 0.8, then system measures 0.48, which would be a bad system. Make the camera 0.9 or 0.4 and system measures 0.54 or 0.24. There is no point where the lens 'outresolves' the sensor.
Similarly, if you keep the same camera and put on a better lens the numbers change but there's no point (in the range of anything reasonable) where one stops having any effect on the other.
Stoffer wrote:
I would still be surprised if the Sony 90mm Macro can't outresolve the 24 MP sensor in the A7III. The copy of that lens has to be pretty terrible for that to be the case, right? Or what am I missing here?
With all respect, what you are missing is System MTF = Lens MTF X camera MTF. (You can substitute resolution or sharpness for MTF if you like.) The key thing it's multiplicative. Basically unless you use a bottle for a lens or a 2 Megapixel camera, where one or the other is near zero, there is no "outresolve".
You can measure them scientifically (a made-up 'megapixels of resolution number' is not science, it's marketing). So if camera measures 0.6 and lens 0.8, then system measures 0.48, which would be a bad system. Make the camera 0.9 or 0.4 and system measures 0.54 or 0.24. There is no point where the lens 'outresolves' the sensor.
Similarly, if you keep the same camera and put on a better lens the numbers change but there's no point (in the range of anything reasonable) where one stops having any effect on the other.
Apr 02, 2019 at 06:44 AM
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