Flat Field Correction: Resolves edge blurring, distortion, field curvature, and chromatic aberration; ED Glass: Effectively eliminates chromatic aberration ; FMC Coating: Enhances light transmission and minimizes light loss; Magnesium Alloy Lens Body: Lightweight, corrosion-resistant, ensuring a longer service life; Diopter Adjustment: Allows people with nearsightedness or presbyopia to view without wearing glasses. Anti-skid Focusing Wheel: Fast and easy to operate for precise focusing.