the image by 1.5, thus a 50mm on a Nikon 7100 becomes a 75mm instantly, if then I enable the 1.3 crop mode, does this effectively make the 75mm a 97.5mm, which is actually a short telephoto? Also are the edges cropped twice, or does is the sensor adjusted in some way? The answer to that determines whether the 1.3 crop mode should ever be used, because if it is just cropping the outlines, this can also be accomplished to exact specs in post processing. ???