Quote Originally Posted by krisb1981 View Post
OK I see that now. There are two scales as you said. One goes down to 1:2 at 24.1 cm. The other one is etched on the barrel and reads 1:2, 1:1.5 and 1:1 ans it would be used with extension rings. And I assume there is no need to compensate the exposure when at 1:2, right?
You would have to compensate, although not much (testing your specific situation is probably the best course of action). I know with my other lenses that do 1:1 it gets more noticeable as you go from 1:2 to 1:1 but not as much from infinity down to 1:2.