Telescopes

GPHYSICS G02Optics G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS

G02B23/00Telescopes

G02B23/02involving prisms or mirrors G02B23/04for the purpose of beam splitting or combining G02B23/06having a focussing action G02B23/08Periscopes G02B23/10reflecting into the field of view additional indications G02B23/105Sighting devices with light source and collimating reflector G02B23/12with means for image conversion or intensification G02B23/125head-mounted G02B23/14Viewfinders G02B23/145Zoom viewfinders G02B23/16Housings Caps Mountings Supports G02B23/165Equatorial mounts G02B23/18for binocular arrangements G02B23/20Collapsible housings G02B23/22Underwater equipment G02B23/24Instruments or systems for viewing the inside of hollow bodies G02B23/2407Optical details G02B23/2415Stereoscopic endoscopes G02B23/2423of the distal end G02B23/243Objectives for endoscopes G02B23/2438Zoom objectives G02B23/2446of the image relay G02B23/2453of the proximal end G02B23/2461Illumination G02B23/2469using optical fibres G02B23/2476Non-optical details G02B23/2484Arrangements in relation to a camera or imaging device G02B23/2492Arrangements for use in a hostile environment G02B23/26using light guides