US PATENT SUBCLASS 359 / 426
.~.~.~ Internal focusing

Current as of: June, 1999
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359 /   HD   OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS

362  DF  COMPOUND LENS SYSTEM {8}
399  DF  .~ Telescope {12}
425  DF  .~.~ Focusing or relatively sliding barrels {2}
426.~.~.~ Internal focusing

DEFINITION

Classification: 359/426

Internal focusing:

(under subclass 425) Subject matter wherein the entrance and exit lenses remain a fixed distance apart while the telescope is focused.