Nikon 50i and E100 manual ER-tube Erect image binooular-tube, ER·tube Erect image binocular-tuba

R-4106.A

MECHANISM ANO PRINCIPLE 4. ER-tube (Erect image binooular-tube)

4.ER·tube (Erect image binocular-tuba)

TIUs ER-tube provided with a roof-type depression pnsm, produces erect images.

•Depression angle: 30°

•Tube magnification: 1X

•Special beam splitter offers brighter images.

•Owing to Siedentopf type adopted, even though the interpupillary distance is changed between 51 - 75 mm, for which prism cover @is vertically tumed and moved, the tube length keeps

constant ali the times.

eOptical system in the binocular body following the beam splitter prism is constructed the sarne as for B-tube.

•As shown in Fig. 5, the light rays between §, @ and §. 1§ are made parallel.

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Bcum .~plil prism

Fig. 15

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