the act of bringing into focus.

Adjusting the position of the lens elements to bring the image into focus, i.e. so that it is clear and sharp.

The process of adjusting the direction and beam size of lanterns. Does not necessarily result in a "sharply focused" image.

System of moving the lens in relation to the image plane so as to obtain the required degree of sharpness of the film.

the act of adjusting the lens-to-film distance so that the subject is sharply focused. Understanding Focus

Adjusting the distance between the lens and the film to form a sharp image of the subject on the film.

Changing the lens to image distance until a sharp image is formed.

Most binocular have a central focusing wheel to make objects at varying distances visible- the central wheel focuses both lenses simultaneously. Most binoculars provide also provide diopter adjustment on the eye pieces. Internal focusing is an important feature for waterproof binoculars- this means all the moving parts are internal and therefore more secure from dust, fog, rain, etc. Tips: Some binoculars don't have a focusing wheel instead everything is from a certain distance away is already in focus. The only problem is that the minimum focusing distance is relatively far- commonly 60 ft. Other factors include the wheel size and place for easy adjustment while wearing gloves.

is a system of moving the lens in relation to the image to obtain the required degree of sharpness.

Screen Refers to Ground Glass. Usually on large format cameras, a piece of frosted glass at the focal plane where the lens projects an image that can be used for focusing and composition.

adjusting the distance between the lens and CCD chip until it produces a sharp image.

The ability to look quickly from distance to near or near to distance without experiencing blurry vision.

Making the microscopy image as sharp as possible by adjusting the objective lens.

Means of adjusting a lens' elements in relation to the film plane so as to obtain the required sharpness in the image.

Adjustment of the lens of the camera to bring the subject into sharp view.

Adjusting a camera's lens system to bring the subject into sharp view.

The in-and-out adjustment of the lens to make the main subject sharp on the film.