Originally posted by aslyfox the Max. Magnification is 0.5
Yes, with the M macros, you need extension to get 1:1, they both have long enough throws to get to 2:1 or 1/2 life size, as-is. With the set of tubes he mentioned, he has enough extension to get to 1:1 with either lens.
The M50 with the number 2 tube should be 1:1; with all three tubes stacked, and the focus all the way out, it should get you to about 1:1.5 or so,
the full set of tubes on the M100 just gets you to 1:1.
For really close, with no working room, try a 24 or 28mm, reversed, with extension tubes, the back of the lens is almost touching your subject. Probably 3:1-ish, depending on how much extension you use.