Angle of view camera–subject distance to preserve the size of a subject, changing the angle of view can indirectly distort perspective, changing the apparent relative size of the subject and foreground. If the subject image size remains the same, then at any given aperture all lenses, wide angle and long lenses, will give the same depth of field. An example of how lens choice affects angle of view. This table shows the diagonal, horizontal, and vertical angles of view, in degrees, for lenses producing rectilinear images, when used with 36 mm × 24 mm format (that is, 135 film or full-frame 35mm digital
Inner regular measure from within by compact sets." Some authors use the term tight as a synonym for inner regular. This use of the term is closely related to tightness of a family of measures, since a finite measure "μ" is inner regular if and only if, for all "ε" > 0, there is some compact subset "K" of "X" such that "μ"("X" \ "K") < "ε". This is precisely the condition that the singleton collection of measures {"μ"} is tight. When the real line R is given its usual Euclidean topology, However, if the topology on R is changed, then these measures