As skeeter mentioned I do have the 3-9 x 50 mm Leupold Euro. Leupold came out with this model to attract the Europeans. To tell you the truth, the 30 mm has no benefits in light gathering any more then the 1” tube. The 30 mm tube has the same internal parts as the 1” tube. The Euro is a little heavier and somewhat a little bulkier but it is a good scope and works well under low light conditions just as the 1” tube would. Go with a 1” tube and simplify your set up...