Internal focusing zoom lens with focusing lens group behind fixed focus lens group
The movable focusing lens group (14) positioned behind a fixed focus lens group (12) is moved backwards and forwards. The internal focusing zoom lens has a first fixing lens tube (24) containing a helicoid (27) in order to move the movable focusing lens group towards the optic axis. The focusing len...
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| Format: | Patent |
| Sprache: | eng ; ger |
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| Zusammenfassung: | The movable focusing lens group (14) positioned behind a fixed focus lens group (12) is moved backwards and forwards. The internal focusing zoom lens has a first fixing lens tube (24) containing a helicoid (27) in order to move the movable focusing lens group towards the optic axis. The focusing lens tube (26) carrying the movable focusing lens group is joined to the first fixing lens tube so that it moves backwards and forwards. A second fixing lens tube (21) contains the fixed lens mount (20) for a fixed focus lens group. At least one component comprises a lens tube (60), a wide-angle converter lens or teleconverter lens on the second fixing lens tube which is deformed although the helicoid of the first fixing lens tube does not deform. |
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