In the part of the review that shows a series of sample images comparing rescaled images against images taken with extenders, I think that instead of saying "0x," it should say "1x." Magnification is multiplicative, not additive, and the multiplicative identity is one, not zero. Another way to think of it is to consider the meaning of 0.5x, which would correspond to a reduction in size--50% magnification. 0.01x would correspond to scaling the image to 1% of its original size. So 1x represents no scaling at all.