I recently purchased a Leupold American Marksman from Cabelas. While it seems to be a good scope, I can't find anything that looks like a fast focus. I have several other scopes, Bushnell AR and Weaver Kaspa, and the fast focus is very obvious with -0+ on the rear eye piece, but the Leupold looks like a standard focus scope with about an inch of micro threads. What am I missing?