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The optical principle of astronomy binoculars
From;    Author:Stand originally
  • The optical principle of astronomy binoculars

    Binoculars is comprised by field lens and ocular, the convex lens that is close to scenery or sunken form illuminator are called field lens, stand by an eye that is called ocular. The illuminant of distant view content inspects parallel light, according to optical principle, parallel light passes lens or spherical sunken form illuminator is met focusing is on, this is a focus. Focus and field lens distance are focal length. It is OK that recycle compares convex or ocular together into resemble enlarge, at this moment observer feels far scenery is pulled close, look particularly clearly.

    Inclined lens of D = of caliber of field lens of D= of focal length of ocular of Fe= of focal length of field lens of Fo= of focus of F = of ocular of E= of O= field lens

    Refracting lens is comprise by a group of lens, reflection type includes a plating glance spherical lens mixes the sunken form of metallic face to make light source lens of plane of 90 degrees of catoptric. Both absorptance is roughly identical. Reflection and illuminator have an advantage each, divide 別 discussion now.

  • Refract and reflex telescopic choice

    The advantage of the refractor

    1. is video and stable

    Microscope limb of refractive type binoculars is sealed, avoided air convection appearance.

    2. brooms correctional like difference

    Use different lens to be combined correctional broom like difference (Coma) .

    3. maintains

    Advocate lens is sealed, won't be eroded by bilge air, basically need not maintain.


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