18-200 is the zoom length from 18mm to 200mm
f3.5-5.6 is the aperture range where it is
f3.5 at 18mm and f5.6 at 200mm
The codes below explain all the other letters
IF ED AF-S DX VR
Auto focus incorporating
Nikon's silent wave motor
(see SWM below).
|Aspherical Lens Elements. A
type of lenses that virtually eliminates the problem of coma and other types
of lens aberration. The are particularly good at correcting distortion in
wide-angle lenses as well as contributing to a lighter and smaller lens
|Close Range Correction System.
Used in fisheye, wide-angle, Micro and selected medium telephoto Nikkor
lenses. It provides a focusing system which works well even at close
distances using lens elements configured in a 'floating element' design
which each one moves independently.
|Distance information. D-type
Nikkor lenses relay subject to camera distance information to Nikon AF
camera bodies, which allows for 3D Matrix Metering and 3D multi-sensor
balanced fill flash. D-type lenses also have a manual aperture ring.
technology. Auto-focus DC Nikkor lenses alls the photographer to control the
spherical aberration in the foreground or background by rotating the lens DC
ring. It creates rounded out-of-focus blue that some portrait photographers
like to use.
|DX coded lenses are Nikon's
range of compact and lightweight digital-only lenses featuring a smaller
image circle that is optimised for use with the DX format image sensor.
Picture angle is approx. 1.5x focal length of a 35mm format equivalent and
they allow a greater wide-angle coverage. They can only be used on Nikon
Digital SLR's. Teleconverters cannot be used with DX lenses. If you put a DX
lens on to an FX camera for example the D3 it will drop into a DX crop
reducing the pixel count by more than half.
|Extra-low Dispersion. ED Glass
- an essential element of Nikkor lenses. Provides superior sharpness and
colour correction by effectively reducing chromatic aberration. Chromatic
aberration is what occurs when light rays of varying wavelengths pass
through optical glass. Nikon have developed several types of ED glass
suitable for various lenses which deliver stunning sharpness and contrast
even at their largest apertures.
|Genesis. G-type Nikkor
lenses relay subject to camera distance information to Nikon AF camera
bodies, which allows for 3D Matrix Metering and 3D multi-sensor balanced
fill flash. G-type lenses have no manual aperture ring.
|Internal Focusing. The lens is
able to focus without physically changing its size, where optical movement
is limited to the interior of the non-extending part of the lens barrel,
allowing for a more compact and lightweight lens as well as closer focusing
|M/A Mode. Allows switching the
lens from Auto-focus to Manual focus with virtually no time lag.
|Found on lenses for Macro
Photography of 1:1 ratio, life-size close-ups. Each lens offers stops down
to f/32, this permits maximum depth of field for close-up and macro
|Nano Crystal Coat an
anti-reflecting coating. It virtually eliminates internal lens element
reflections and reduces ghost and flare particular to ultra-wide zooms.
|Perspective Control. These
lenses are equipped with a tilt and shit mechanism that allows photographers
to manipulate image perspective, distortion and focus. They have 1:2 life
size macro capability. Ideal for commercial photographers who shoot table
top product photos, or building photography.
|New perspective control
lenses, we haven't yet worked out what the E stands for.
|Rear Focusing. A system were
all the lens elements are dividing into specific groups, with only the rear
group moving for focusing, making the auto-focus operation smoother and
|Superior Integrated Coating.
This is a multilayer lens coating that helps reduce ghost and flare to a
negligible level, as well as minimising reflection in the wider wavelength
range and superior colour balance and reproduction.
|Silent Wave Motor. This gives
lenses a quick, ultra-quiet focusing system. This system works by converting
travelling waves into rotational energy to focus the optics. This enables
high-speed auto focusing.
|Vibration Reduction. Nikon's
innovative system to minimise image blur caused by camera shake, and allows
shooting at a shutter speed 3 stops (eight times) faster. It enables
handheld shooting at dusk, at night, and even in poor light. It also detects
automatically when the photographer is panning. VR lenses have two angular
velocity sensors, one to detect up-down motion and the other to
left-right motion. Calculations are performed on the collected data and the
results are used to compute the target position to which the VR lens group
is moved. Voice-coil motors then move the VR lens group into that position.