Lens assembly

A lens assembly comprising:

• a barrel detachably coupled to a camera;
• a focusing lens;
• a driving unit moving the focusing lens by generating a driving force with power supplied from the camera;
• a single input button receiving a user command, wherein the user command comprises a custom focus storage command and a custom focus adjustment command;
• and
• a control device controlling the driving unit to move the focusing lens when the custom focus adjustment command is input through the single input button, wherein the focusing lens moves to a preset custom focus position when a custom focus position is preset, and moves to a default focus position when the custom focus position is not preset,
• wherein the custom focus adjustment command comprises selecting the single input button for a preset threshold range of time,
• wherein the custom focus storage command comprises selecting the single input button for more than a preset threshold time,
• wherein an operation mode of the control device comprises a custom mode and a non-custom mode, and
• wherein the lens assembly comprises an output unit including a light emitting diode (LED) which outputs the operation mode of the control device, and the output unit outputs light of different colors in the custom mode and the non-custom mode.