Abstract: A lens optical system includes a first lens group in which a first lens of an object side is composed of a meniscus lens having a positive refractive power, and having a positive refractive power as a whole, a second lens group arranged closer to an image side I than the first lens group, the second lens group being a focusing group for correcting a change in image distance depending on a change in object distance, being composed of a single lens, and having a negative refractive power as a whole, and a third lens group arranged closer to the image side I than the second lens group, the third lens group including a plurality of lenses and having a positive refractive power as a whole.

Abstract: Provided are a camera lens assembly capable of communicating with a camera body and having a controller and a memory therein. The camera lens assembly includes a user interface through which functions represented by a plurality of modes are designated by a user, a switch for selecting one of the modes to which the functions have been designated, a switch detection unit for detecting the current mode of the switch, a manual ring detection unit for detecting the operation of a manual ring provided on the outside of the camera lens assembly so that the user can operate the manual ring by a rotating method; and a lens controller for, when the operation of the manual ring is detected, carrying out a designated function according to the detected current mode of the switch.

Abstract: A lens optical system includes a first lens group in which a first lens of an object side is composed of a meniscus lens having a negative refractive power, and having a positive refractive power as a whole, a second lens group arranged at an image side I than the first lens group, the second lens group being a focusing group for correcting a change in image distance depending on a change in object distance, being composed of two or less lenses, and having a positive refractive power as a whole, and a third lens group arranged at the image side I than the second lens group, the third lens group having a negative refractive power as a whole, in which a first lens of the image side I is composed of a concave or meniscus lens.

Abstract: A lens optical system includes a first lens group in which a first lens of an object side is composed of a meniscus lens having a positive refractive power, and having a positive refractive power as a whole, a second lens group arranged closer to an image side I than the first lens group, the second lens group being a focusing group for correcting a change in image distance depending on a change in object distance, being composed of a single lens, and having a negative refractive power as a whole, and a third lens group arranged closer to the image side I than the second lens group, the third lens group including a plurality of lenses and having a positive refractive power as a whole.

Abstract: The present disclosure relates to a lens optical system, which includes: a first lens group having a positive refractive power; a second lens group which performs focusing and has a negative refractive power; and a third lens group having a positive refractive power. A lens among lenses included in the first lens group, which is closest to an object, is a meniscus lens having a positive refractive power, the second lens group includes only a single lens, and a lens among lenses included in the third lens group, which is closest to an image, is a meniscus lens having a negative refractive power. When the second lens group performs focusing, the first lens group and the third lens group are fixed, have F number of 1.8 or lower, and have a half field of view within a range of 13 to 18 degrees.

Abstract: A camera lens assembly includes a lens holder for accommodating at least one lens, a pin protruding from the lens holder in a radial direction of the at least one lens, a ring member with which the pin is engaged, the ring member having a cam groove formed in a spiral direction to have a predetermined pitch along an optical axis and being rotatable about the optical axis according to a user's operation, and a guide device for guiding the lens holder to move only in a direction parallel to the optical axis. In particular, when the ring member rotates, the lens holder on which the pin is formed moves in the direction parallel to the optical axis within the pitch under the guide of the guide device.

Abstract: The present invention relates to a camera lens assembly having a structure using a plurality of focusing units. The lens holder according to the embodiment of the present invention includes a first fastening unit to which any one focusing unit of the plurality of focusing units is fastened, a second fastening unit to which the other focusing unit of the plurality of focusing units is fastened, a first guide bar fastening groove configured to protrude from the lens holder to determine a position of the lens, and a second guide bar fastening groove configured to horizontally maintain the lens and prevent rotation of the lens.