... :55mm-75mm Diopter Adjustment Range: 5, Objective Infinity Achromatic: 4X, 10X, 40X(S), 100X(S, Oil) Infinity Plan Achromatic: 4X, 10X, 40X(S ... -H Lamp with Adjustable Brightness High-Point Eyepiece WF15X/15mm Objective Infinity Plan-Achromatic 20X(S) Infinite Plan-Achromatic PH10X, PH20X(S ...