Found this showing the pixel patterns of some displays:
It has the iPhone 4 but not the retina Touch,
if you have a macro lens and tubes you should be able
to get a similar magnification by cropping.
Be interesting to see the results...

It has the iPhone 4 but not the retina Touch,
if you have a macro lens and tubes you should be able
to get a similar magnification by cropping.
Be interesting to see the results...