The Swarovski Z3 4-12X 50MM; slim yet big on detail Even in the 1-inch class you don't need to go without backup lighting and higher magnification. The Swarovski Z3 4-12x50 L is designed to cope with these values - even with an incredibly lightweight design. The Swarovski Z3 4-12x50 BT L's ballistic turret can be separately adjusted to your personal ballistic requirements, allowing you to stay on target at different distances.