Image quality can go significantly over 1.0, using an a7r with the sony zeiss 50mm (one of the sharpest lens/body combos on the planet) with the images downsized from 36mp to 12mp shooting at iso 100 f16 I was getting wild quality readings. Of course, it's not really necessary, my canon 100Ds get around .85 and generate similar quality point clouds for 1/6th the price, part of this is the extra depth of field from using a crop lens camera. Still, the sony was nice...