When Using a Nikon lens (Nikkor) you must be noticing the strange term such as VR, ED, FX and all that stuff, well, here Kucaks are going share with U guys what is those words means.
VR – is “vibration reduction”, a technology lifted from camcorder image stabilizers. The lens electronically compensates for unsteady hands. VR is especially important at long focal lengths, e.g., 200mm and above, because the lens magnifies camera shake at the same time it is magnifying the subject. A VR lens will allow you to use slower shutter speeds without introducing camera shake. The alternative to a VR lens would be mounting the camera on a tripod or using a high ISO setting, which reduces image quality but allows the use of higher shutter speeds.
ED – is “extra-low dispersion” glass, a more expensive and higher quality glass that reduces chromatic aberration, in which light of different colors takes different paths through the lens, which would result in a dot of white light being fuzzed up by the time it reaches the film or sensor.
IF – is internal focus, meaning that the lens does not change physical length as you focus on subjects that are closer or farther away.
DX – are Nikon’s lenses that only work on its small-sensor digital SLR bodies, i.e., they don’t cast a large enough image circle to be used on a film camera.
FX – refers to the full frame sensor
G – lenses are Nikon’s newest lenses. They don’t have an aperture ring, which is a shame because it means that you are forced to adjust the aperture with a command wheel on the camera. The G lenses don’t work on older bodies.
AF-S – is “silentwave motor”. Old-style Nikon autofocus lenses did not have motors in the lens, but relied on a screwdriver blade in the camera body to turn the focus ring. An AF-S lens has a built-in ultrasonic motor, a technology copied from the Canon EOS system. When using an AF-S lens, the photographer can push the shutter release (or a button on the rear of the camera, if a custom function is set) and let the autofocus system do its best, then touch up the focus manually by twisting the lens ring. The AF-S lenses also focus faster and more quietly.