TDB products 1st/2nd Focal Illumiated scopes, Big size objective lens scopes, side focus type scopes, full & half saddle scopes. The 1st focal plane scope is when you magnify the scope, the size of reticle will grow in proportion to the power. The big size of scope is designed for hunting and long-range target and varmint hunting. The objective at a long distance must be brighter to identify accurately. This scope is a satisfaction of the above requirement. The side focus type scope is conveniently located on the saddle. This allows the hunters and shooters to easily make quick and precise parallax correction while viewing the target.