MA521 Super Widefield 30X Eyepiece designed for EMZ, EMT, EMF models MA521 Super Widefield Eyepiece 30X (pair) Field No. 7.7, with 30.5mm O.D.(Outer Diameter), with no reticle mount. This 30X Super Widefield Eyepiece is designed to fit our Meiji Techno models EMZ (Zoom Series), EMT (Turret Series), EMF(Fixed Series), not compatible with High Eyepoint Models.