Originally Posted by bkondeff
Does a 1" tube have an "optical" limitations over a 30mm tube. I thought the difference was only strength/durability. I've been wrong before.....
Not necessarliy. Some believe it does, but in reality, the clarity of a 1" tube can equal a comparable scope with a 30mm tube. Clarity and light transmission depends mostly upon a combination of glass and coatings, and a properly matched objective lens. A 50mm lens with lousy glass won't do much for you, but a 50mm objective with suitable glass performs really well.
In the case of the Zeiss, the quality of the glass and coatings seem to make up the difference between the 44 and 50 objective. I can't tell a difference between the two in any lighting condition. Both are outstandingly clear.
The biggest benefits of a 30mm are more internal adjustment, stronger main tube, and they provide more area for the scope rings to grip for hard recoiling rifles.