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Nikon 18-200mm.

SPECIFICATIONSFull Name: Nikon AF-S Zoom-Nikkor D 18 - 200 mm f/3.5 - 5.6G DX ED IF VR. Different countries will

use different combinations of all this alphabet soup.

AF-s means it focuses silently and you have instant manual override just by grabbing the focus ring.

D means it tells your camera's meter the distance to your subject. This helps a little for flash exposuremetering.G means it has no aperture ring so it won't work on ancient cameras that require one. Since these oldcameras are film cameras it wouldn't matter anyway.

DXmeans it only works on digital cameras. The corners will be black at many focal lengths on a filmcamera.

ED is special glass used to increase sharpness.IFis Internal Focusing. The lens focuses with only the slight motion of a few internal elements instead ofhaving to crank the entire lens in and out. This means the front no longer rotates as you focus, making

polarizing and grad filter use easy.

M/A (Manual/Automatic) mode means that even while in autofocus you may simply grab the focus ring

to make manual focus adjustments. Next time you tap the shutter it returns to AF mode, and next timeyou grab the ring you're instantly in manual mode. I wish everything on earth worked this well.

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SIC is Nikon's latestmulticoating to increase light transmission and reduce ghosts.SWM is a Silent Wave Motor, which is an ultrasonicpiezo device similar to Canon's USM. It movesthings without making noise. The lens focuses silently, handy for snoop photography and for sensitive

pets and wildlife.

VR is Vibration Reduction. It lets you get sharp images without a tripod. The lens works internally tocompensate for camera motion, vibration and shake. Of course it can't compensate for your subjectmoving.

I have a page about all this and more here.Focal Length: 18 - 200 mm is similar to a 28 - 300 mm lens on a 35 mm camera.

Aperture: f/3.5 at 18 mm, f/5.6 at 200 mm.

Maximum Aperture vs. Focal Length18 mm: f/3.535 mm: f/4.260 mm: f/4.895 mm: f/5.3

200 mm: f/5.6Optics: 16 elements in 12 groups. That includes two ED glass elements, shown in yellow, and threeaspherical elements shown in blue. The VR group is inside the red box, as seen in the diagram atNikon's site.Close Focus: Nikon's rating is 1.6 feet (20" or 0.5 meters) throughout the entire zoom range. This is

fabulous! Mine is even better: at 200 mm it focuses to 16" (0.4m) from the image plane. This is closerthan 8" (0.2m) from the front of the lens since the lens pokes out 9" from the image plane at 200 mm. At18 mm mine focuses to 15" (0.38 m) from the image plane or 9.5" (0.24m) in front of the lens. This allmeans you always can get close enough.

Maximum Macro Ratio: 1:4.5. This is great. This means you can fill your frame with an area as small as

4-1/4 x 2-3/4" (108 x 72 mm)!

Seven-bladed rounded diaphragm stopping down f/22 (18 mm) to f/36 (200 mm). It works well and isvery round at every aperture at which this would be important.

72 mm filter size. WHOOPS! I use mine with a 72 -> 77mm step up ring at all times for compatibility with

my other pro lenses. It does not vignette.

HB-35 Bayonet Lens Hood included. Flower-shaped. I never use these since they get in the way. I usemy hand in rare cases where the sun's shining in my lens. The 18 - 200 is particularly resistant to ghostsanyway. The hood is a miracle: it's designed so that it can be used even if I have my 77 mm step-up

ring and 77 mm filter in place. Of course if you use 77 mm accessories as I do you have to reach deeplyinto the hood to attach and remove them, and you can't remover the hood unless you first remove thestep up ring.

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CL-1018 Lens Pouch included. I seems to be a weird fake suede. It's not very padded. It's a floppy

pouch with a flat, hard round bottom. It folds flat. I never use these. My 18 - 200 is always on mycamera!

Size: 3.0" (77 mm) diameter. Extension from lens flange (length excluding rear mount extension) is 3.8"(96.5 mm) 18mm and 6.4" (162 mm) zoomed out to 200 mm. Erectile function is roughly linear as the

zoom ring is rotated.

Weight: 19.790 oz (561.1g), measured. Nikon specifies 19.8 oz (560 grams