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The Sony RX1 shows how small you can get today for a full frame sensor, but the size of the lens is pretty big, because of the physical limitations of optics.

I have a 5D Mark III and there is a huge difference in quality with my iPhone 5. I can put on a f1.2 lens on the 5D and get amazing autofocus accuracy with a depth of field (DOF) of millimeters in low light and get an amazing shot at ISO 10,000. The phone is impressive for what it is but the autofocus doesn't have to do much because the DOF is so big. If you have a bigger sensor and more megapixels you need a good quality lens and good autofocus.

On the other hand GoPro have a pretty good quality output where big DOF is a good thing and they focus on high frame rate video for action. I would love if my phone had better image stabilization (e.g. Luma app) and went up to 120fps at full HD. That would be achievable soon.




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