hey guys. i have been doin photography for just a few months now, and im really enjoying it! i was thinking of getting a zoom lense but im not sure about the 50 - 200 or 70 - 300 etc... so i was hoping you could help me. i have an olympus OM40 and i mainly take black and white landscape. basically, i would like a good zoom on the camera. i dont know to much about how the numbers work, (ino it may sound stupid) thanks for any help!!