ZUIKO Om 200mm f4 with raynox?
Please read this carefully and your will eventually be able to calculate the magnification of your system.
(Thanks to the original poster; Riccardo Polini)
One thing you have to know is the strength of RAYNOX DCR250 (diopter value) which, in my opinion, you can search from RAYNOX website.
|AF4_2483 Surfing the Serengeti by DaveInHouston|
from Hot Air Balloon view
|Peregrine Falcon by Psychic1|
from Best Wildlife Photo of the Week - 4