Product Description

Lenses are designed for exclusive use on digital cameras with smaller-size imagers and inherit all of the benefits of the Di products. These lenses are not designed for 35mm film cameras and digital cameras with image sensors larger than 24mm x 16mm.At Tamron, quest has always been to make the ideal zoom lens. As a result of this ongoing challenge, Tamron has introduced the concept of the high-power zoom lens in the new AF18-200mm XR Di II for exclusive use with digital SLRs. Tamron's original development of proprietary core technologies such as Aspherical element production, Multiple Cam Mechanism and Integrated Focus Cam design lend to the creation of the world's lightest, most compact 11.1X zoom lens made for digital SLR cameras.The 18-200mm (28-300 when converted to 35mm) provides the digital photographer with the versatility of a true wide to ultra tele-zoom in an amazingly easy to use design.

Product Details

• Brand: Tamron
• Model: Canon AF
• Dimensions: 4.10" h x 4.10" w x 5.30" l,

Features

• Since the lens is designed exclusively for digital SLR photography, it provides high image quality in terms of resolution
• It employs a new optical system designed to confine the changing angles of incidences of light rays reaching the imager over the entire image field.
• Peripheral light fall-off is minimized when compared with that of conventional lenses
• Complicated mechanisms are built in the compact body thanks to new mechanical artifices. The lens is a multi-purpose zoom lens,excellent portability
• The Zoom Lock prevents unwanted barrel extension when carrying the lens/camera combination

Amazon.com Product Description
Designed for exclusive use on Canon digital SLR cameras with smaller-size imagers, this Tamron AF 18-200mm f/3.5-6.3 Di-II aspherical macro zoom lens is ideal for a host of situations. The high-power zoom lens--which offers an equivalent focal length of 28-300mm in 35mm format--adds versatility to your lens menu, zooming from a true wide perspective to an ultra tele zoom, all in an amazingly easy-to-use design. As a result, the lens is ideal for everything from landscape shots to sports and wildlife photography. The lens also incorporates several of Tamron's proprietary core technologies, including aspherical elements that minimize chromatic aberration, a multiple cam mechanism, and an integrated focus cam design. The technologies combine to create the world's lightest, most compact 11.1x digital zoom lens. Other features include an angle of view of 75 to 7 degrees, a minimum focusing distance of 17.7 inches, and a 62mm filter diameter. All Tamron lenses carry a six-year warranty.

Note: The Tamron AF 18-200mm f/3.5-6.3 XR Di-II zoom lens is not designed for conventional cameras or digital cameras with image sensors larger than 24mm x 16mm.

Specifications

• Focal length: 18-200mm
• Maximum aperture: f/3.5-6.3
• Lens construction: 15 elements in 13 groups
• Angle of view: 75 to 7 degrees
• Type of zooming: Rotation
• Diaphragm blades: 7
• Minimum aperture: f/22
• Minimum focusing distance: 17.7 inches
• Macro magnification ratio: 1:3.7 (at f=200mm)
• Filter size: 62mm
• Corresponding mounts: Canon
• Lens hood: Yes, flower shaped
• Dimensions: 2.9 inches in diameter and 3.3 inches long
• Weight: 14 ounces
• Warranty: 6 years

Customer Reviews

Good value - useful all-in-one lens
Like a baseball player with a decent batting average, some power, a little bit of speed and fairly good fielding ability, the Tamron 18-200 lens won't be an All-Star any time soon because it does not excel at any one thing. But, like that $500k/year utility infielder, this lens DOES provide a very good all-around value for what it is. Does it compare to a prime lens at either end? Heck, no. Is it a good lens to use when you can't carry a wide choice of lenses with you? Absolutely.

I've been using this lens on my 20D quite a bit and have only a few minor gripes: it tends to hunt for AF (especially as you get closer to 200mm), and it's not the quietest lens I've used.

An earlier reviewer mentioned that it maxed out at about 160mm. My own analysis shows that it is short of 200mm, but not by that large an extent; I found it much closer to 190. Still, there's no doubt that these zoom lenses with extreme ranges like this have a built-in fudge factor.

Another reviewer described the problems he encountered when using two screw-on filters. There aren't too many primes that I've used that will avoid vignetting when using two filters. Heck, my 10-22 can barely handle one extra-slim. As for darkening the image - well, you're adding two more pieces of glass to a highly-complex lens assembly... just asking for trouble.

As for the concern regarding blur at longer focal lengths, I highly recommend the use of a tripod. I noticed the exact same thing - blur and lack of sharpness - at lengths over 100mm. Keep the old rule of thumb in mind - if you're shooting handheld, your shutter speed should be no slower than the inverse of your focal length. A 200mm lens on a 20D (or Rebel XT for that matter), is an effective 320mm - I wouldn't recommend shooting any slower than 1/500 at max zoom with this lens - UNLESS you're using a tripod. When I mounted it firmly, I got great shots with no blur.

Keep in mind that you get what you pay for here: the convenience of a wide-angle, normal, and moderate telephoto lens in one piece. If you're shooting professionally, or need absolutely perfect images, then carry the three or four lenses that this would otherwise replace in your bag. But if you want one easy-to-use, satisfactory lens, go for this one. It's a jack-of-all-trades, ace-of-none kinda deal.

Great all use lens
I recently purchased this lens for use on my Canon 20D. I was never happy with the lens that came with the camera. I've been very happy with this lens.

Pros:
- Quality construction. The lens doesn't feel cheap.
- Zoom range of this lens is fantastic.
- Image quality is great.
- Internal focusing makes using filters and hoods a piece of cake
- Zoom lock is nice so the zoom ring doesn't turn while stored or carried.
- Price. For the money this lens will give you a lot of bang for the buck.

Con:
- Auto focusing is a bit slow for a moving subject.

Never ceases to amaze
I have owned this lens for over a year now and it never ceases to amaze me when I see the photos it produces. Over this last year I have come to learn a thing or two about how to use this lens.

1) If you are going to shoot indoors, or in low light, with a long focal length (like 200mm) use a tripod or plenty of ambient light. This lens doesn't have a built in image stabilizer so you are going to steady the lens with the tripod or use a real fast shutter speed to minimize your hand jitter.

2) Use a smaller aperture. I have found that my best photos come from an aperture of 8.0 thru 16. These apertures aren't great for bokeh (background blur) but they sure do allow you to take razor sharp pictures.

Praise.

Focal range. With one lens you are able to take nice wide-angle shots (18mm) and with the twist of zoom ring you have a nice telephoto lens (200mm) Definitely a good walk around lens for the day at the botanical gardens, museum or amusement park.

Build quality. This lens gives you a nice solid feel in your hands. Give it a shake and it doesn't make a sound. The zoom and focus rings move smoothly without being sloppy. With a lens this well built you would expect it to be heavy. Not so with this lens, it's quite light (which is something you really appreciate after a long day of carrying it around.)

Minimal chromatic aberrations. The lens' three hybrid aspherical elements and two low dispersion glass elements correct for almost all lateral and on-axis aberrations making most of your images optically clear.

Size. At it's lowest focal length (18mm) the lens is small enough to fit into a mid size top loading camera bag while still attached to the camera body.

Complaint?

Well yes, I do have one minor complaint about the lens. Auto focus is slow. How slow? Well let's just say you won't want to try and photograph a two year old on the move. I have found that I can keep fast moving objects in better focus by switching to manual.