Focusing method selectable zoom optical system
Focusing systems for perspective dimensional measurements...
Focusing unit and optical device
Four-group zoom lens
Four-group zoom lens
Four-group zoom lens
Four-unit zoom lens system having a high zoom ratio
Ganged focus mechanism for an optical device
Great aperture zoom lens
Great relative aperture telephoto zoom lens
Great relative aperture zoom lens
Guide apparatus of cam ring
Guide device for zoom lens barrel
Headlight glass for a motor vehicle, a method of making a mold d
High magnification compact zoom lens
High magnification zoom lens
High magnification zoom lens
High magnification zoom lens barrel including a drive ring havin
High magnification zoom lens system
High magnification zoom lens system