Eyepieces sentence example

eyepieces
  • These eyepieces are very convenient in use, for when they are changed the lower focus always falls in about the same plane.
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  • This gave an orthoscopic image even in ordinary eyepieces.
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  • In both cases two eyepieces are employed, one to view each separate web.
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  • There are three eyepieces which are mounted on a revolving sleeve in such a way that any one of them can be quickly brought into use, to give the magnification suitable to the height of the mast.
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  • These eyepieces are intentionally provided with a different chromatic magnification, which however is in opposition to that originating in the objective.
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  • As powerful achromatic objectives show differences of chromatic magnification in the same way as apochromats, compensation eyepieces can be used in combination with these objectives.
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  • A second manner of making stereoscopic observations employs stereoscopic eyepieces.
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  • The system of Porro prisms employed affords a convenient method of adapting the ends of the eyepieces to the interpupillary distance.
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  • Some appear to be capable of being used with the high power objectives which normally perform better with compensating eyepieces.
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  • Best results are obtained with high point wide field eyepieces.
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  • The unit contains a reducing lens which restore the field of view to cover approximately the same area as standard x10 widefield eyepieces.
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  • Small German periscopes were usually 1 metre or 2 a metre in length and had two eyepieces giving magnifications 10 and 15 diameters.
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  • In both eyepieces micrometers or cross-wires are used for measuring in the plane of the real FIG.
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