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Focus (optics) print that page

DOF-ShallowDepthofField

In geometrical optics , a focus , also called an image point , is the point where light rays originating from a point on the object converge. [ 1 ] Although the focus is conceptually a point, physically the focus has a spatial extent, called the blur circle . This non-ideal focusing may

Depth of focus print that page

While the phrase depth of focus was historically used, and is sometimes still used, to mean depth of field , in modern times it is more often reserved for the image-side depth. Depth of field is the range of distances in object space for which object points are imaged with acceptable sharpness

wikipedia.org | 2011/5/8 7:05:39

Depth of focus (photography) print that page

While the phrase depth of focus was historically used, and is sometimes still used, to mean depth of field , in modern times it is more often reserved for the image-side depth. Depth of field is the range of distances in object space for which object points are imaged with acceptable sharpness

wikipedia.org | 2011/5/8 7:01:50

Cassegrain reflector print that page

DSN_Antenna_details

eyepiece , a camera , or a light detector . Alternatively, as in many radio telescopes, the final focus may be in front of the primary. In an asymmetrical Cassegrain, the mirror(s) may be tilted to avoid obscuration of the primary or the need for a hole in the primary mirror (or both). The

Fixed focus print that page

A photographic lens callate conchatumadrefor which the focus is not adjustable is called a fixed focus lens. The focus is set at the time of manufacture, and remains fixed. It is usually set to the hyperfocal distance , so that the depth of field ranges all the way down from half that

wikipedia.org | 2010/9/26 12:15:56

Focus stacking print that page

Focus_stacking_Tachinid_fly

Focus stacking offers flexibility; as focus stacking is a computational technique images with several different depths of field can be generated in postprocessing and compared for best artistic merit or scientific clarity. Focus stacking also allows generation of images physically impossible

Optics print that page

Light_dispersion_of_a_mercury-vapor_lamp_with_a_flint_glass_prism_IPNr%C2%B00125

electromagnetic descriptions of light are, however, often difficult to apply in practice. Practical optics is usually done using simplified models. The most common of these, geometric optics , treats light as a collection of rays that travel in straight lines and bend when they pass through

Lensbaby print that page

Lensbaby-sample

The front standard can be manipulated off axis to move the sharpest area of focus (called the "sweet spot") to almost anywhere in the frame. Therefore the important part of the subject can be rendered fairly sharp with everything else out of focus , even if it is the same distance from the

Camera lens print that page

Photographic_lenses_front_view

A camera lens (also known as photographic lens , objective lens or photographic objective ) is an optical lens or assembly of lenses used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media capable of storing an image

Camera print that page

Cameras

cameras have a lens positioned in front of the camera's opening to gather the incoming light and focus all or part of the image on the recording surface. The diameter of the aperture is often controlled by a diaphragm mechanism, but some cameras have a fixed-size aperture. Most 20th century