Interesting.. "This gives a value for x of about 4 µm. In a digital camera, making the pixels of the image sensor smaller than this would not actually increase

Interesting.. "This gives a value for x of about 4 µm. In a digital camera, making the pixels of the image sensor smaller than this would not actually increase image resolution." So, the HTC One, which only has a 4 megapixels is already at that limit: http://www.htc.com/www/zoe/ultrapixel-sensor-size/ http://www.htc.com/www/zoe/ultrapixel-sensor-size/ (and if the marketing graph below is true, the Nokia sensors are half as big..)