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The 7-21x21 Joyful M Binocular from Vixen Optics is a reverse Porro zoom optic that combines a waterproof housing with multicoated lenses to create a general purpose set ready for use at home, on vacation and in the audience. Joyful series glasses have a reverse Porro prism design and BK7 prism glass, which allow these binoculars to transmit enhanced depth of field and clarity. This configuration from the Joyful M series features a 7-21x zoom range, making it well-suited for almost any viewing task—up-close or far away.
|Front lens diameter (mm)||21|
|Exit pupil (mm)||1.0-3.0|
|Interpupillar distance (mm)||56 - 73|
|Eye relief (mm)||12.0 - 9.0|
|--Field of view--||-|
|True field of view (°)||2.3-4.3|
|Apparent field of view (°)||30.1- 48.3|
|--Area of application--||-|