Nikon Micro-Nikkor 200mm f/4 IF - Manual (Page 15)

Reproduction Ratio
The reproduction ratio is the numerical ex­
pression of the relationship between the image
size and the actual size of the subject. For
example, if the image on the focusing screen is
one-fifth the actual size of the subject, the
reproduction ratio is said to be 1:5, and is
indicated on the reproduction ratio scale of
the Micro-Nikkor 200mm f/4 by the number
“5.”
m 8 7 6
! 6 5
2 1.5