John, certainly the 2.5x Leupold is still made - http://www.leupold.com/hunting-and-shoot...0mm-ultralight/

The problem is it's a 2.5x with long eye relief so the field of view isn't great - 13.2m @ 100m.

The Zeiss 1.1-4x24 at 1.1 gives you 38m @ 100m and can be cranked up to 4x for long shots where it still has 10.5m @ 100m. I think those two facts alone make it, or others with a similar specification, an ideal choice for those who want to put a scope on a double.