I have a Nikon 120 Macro lens which I have used only for very close working. I read somewhere that 'peak performance is in the range 1:5 to 5:1 magnification. Please could someone explain to me what these ratios mean? I assume 5:1 is 5x life size, but what is 1:5?
I ask this because I am wondering what this lens would be like for portraits?
Thoughts or comments appreciated.