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An internal focus lens (sometimes known as IF) is a photographic lens design in which focus is shifted by moving the inner lens group or groups only, without any rotation or shifting of the front lens element. This makes it easy to use, for example, a screwed-in polarizing filter or a petal shaped lens hood. During macro photography, using an internal focus lens reduces the risk of the front of the lens accidentally hitting the subject during focusing as the front element does not move.[1]
The physical size of an internal focusing lens does not change during focus, nor does the front of the lens rotate. This is particularly useful for large lenses, keeping the size more compact, or when using filters or accessories mounted on the front of the lens that may require careful alignment.
One issue internal focusing lens can have is that the true focal length of the lens is reduced when not focused at infinity.
photography, using an internalfocus lens reduces the risk of the front of the lens accidentally hitting the subject during focusing as the front element...
Internal medicine, also known as general internal medicine in Commonwealth nations, is a medical specialty for medical doctors focused on the prevention...
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in radio transmission or reception Internalfocusing, a lens technology in which focusing occurs only with internal elements Iodine monofluoride, an unstable...
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Relationship Focusing Family Constellations Intrapersonal communication Inner Team Inside Out (2015 film) Minor, Amanda J. (2016). "Internal Family Systems...
algorithm used by the lens. If the focusing algorithm only considers the distance the focusing ring is turned (called linear focus-by-wire), then the behavior...
In physics, total internal reflection (TIR) is the phenomenon in which waves arriving at the interface (boundary) from one medium to another (e.g., from...
interoperate with the first generation of Nikkor lenses featuring internalfocusing motor. Despite not being intended for the professional market, the...
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100 ISO film Focusing screen N type A — matte Focusing screen N type A4 — checker/grid Focusing screen N type B — rangefinder spot Focusing screen N type...
explosive movements and a focus on physical strength and agility. External styles include both the traditional styles focusing on application and fighting...
internal auditors possessed the skills required to help companies meet the requirements of the law [citation needed]. However, the focus by internal audit...
intuition. He introduced them with having either an internallyfocused (introverted) or externally focused (extraverted) tendency which he called "attitude"...
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reproduction ratio is 16:1). The use of automatic focus is not advisable if the first lens is not of the internal-focusing type, as the extra weight of the reverse-mounted...
haemolymph circulates to the interior organs. Like their exteriors, the internal organs of arthropods are generally built of repeated segments. Their nervous...
The Bureau of Internal Revenue (Filipino: Kawanihan ng Rentas Internas, or BIR) is a revenue service for the Philippine government, which is responsible...
The People's Commissariat for Internal Affairs (Russian: Народный комиссариат внутренних дел, romanized: Narodnyy komissariat vnutrennikh del, IPA: [nɐˈrodnɨj...
Retrieved 20 March 2018. Tan & Islam 2007, p. 342. internal displacement monitoring centre. "Myanmar". internal displacement monitoring centre. Archived from...
culture. Examples include external/internal, strong/weak, flexible/rigid, and many others. Culture can be externally focused, aiming to satisfy customers,...
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