3x25(A) with chain opera glasses 1),magnification:3x 2),aperture:25mm 3),filed of view:7degree 4),lens:optical lens, FMC specification: Magnification3xObjective lens Diameter25mmAngle of view7Field of View122M/1000Mentrance pupil27mmexit pupil9mmlensFMC ,optical lens (anti-reflection blue coating)lens systermGalileomaterial metal ,plated in gold or silver, optical lensFocusing system center item ...