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Tamron Auto Focus 18-200mm f/3.5-6.3 XR Di II LD Aspherical (IF) Macro Zoom Lens for Pentax Digital SLR Cameras (Model A14P)
- Lenses are designed for exclusive use on digital cameras with smaller-size imagers
- Not designed for conventional cameras and digital cameras with image sensors larger than 24mm x 16mm
- Concept of our high-power zoom lens
- For exclusive use with digital SLRs
- Most compact 11.1X zoom lens made for digital SLR cameras
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|Aperture Control Design||Aperture controlled by camera|
|Compatible Lens Hood Part Number||Flower-shaped hood|
|Compatible Mountings||Pentax K|
|Item Dimensions||2.91 x 2.91 x 3.31 inches|
|Item Weight||0.88 pounds|
|Maximum Focal Length||200 mm|
|Maximum Format Size||APS-C / DX|
|Minimum Focal Length||18 mm|
|Photo Filter Thread Size||62 mm|
|Real Angle Of View||75 Degrees|
|Shipping Weight||1.32 pounds|
From the Manufacturer
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 11x zoom lens made for digital SLR cameras.
Lenses are designed for exclusive use on digital cameras with smaller-size imagers and inherit all of the benefits of our Di products. These lenses are not designed for conventional cameras and digital cameras with image sensors larger than 24mm x 16mm.
Extra Refractive Index Glass (XR)
Low Dispersion (LD)
Low dispersion (LD) glass elements in a lens help reduce chromatic aberration; the tendency of light of different colors to come to different points of focus at the image plane. Chromatic aberration reduces the sharpness of an image, but glass with an extremely lowdispersion index, has less of a tendency to separate (defract) a ray of light into a rainbow of colors. This characteristic allows the lens designer to effectively compensate for chromatic aberration at the center of the field (on axis), a particular problem at long focal lengths (the telephoto end of the zoom range), and for lateral chromatic aberration (towards the edges of the field) that often occurs at short focal lengths (the wide-angle end of the zoom range.)
Internal Focus (IF)
Internal focusing (IF) provides numerous practical benefits to photographers including a non-rotating front filter ring that facilitates the positioning of polarizing and graduated filters, and more predictable handling because the lens length does not change during focusing. Even more important, Tamron’s Internal Focusing (IF) system provides a much closer minimum focusing distance (MFD) throughout its entire focusing range. In addition, IF improves optical performance by minimizing illumination loss at the corners of the image field, and helps to suppress other aberrations that become more troublesome at different focusing positions.
Another original Tamron mechanical engineering concept is the Zoom Lock (ZL), a simple convenience feature that prevents undesired extension of the lens barrel when carrying the camera/lens unit on a neck strap.
Style: Pentax | Package Type: Standard Packaging
Top Customer Reviews
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.Read more ›
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.
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?Read more ›
Well, the Tamron won! In particular, the Tamron 18-200mm F/3.5-6.3 AF DI-II LD Lens f/ Nikon w/ Built-in motor, 6-Yr US Warranty. When I saw the $100 rebate offer there was no thinking, just ordering. Most of the New York City dealers utilize free shipping and no tax as marketing tools and it works! As I was going to a Car Show on Saturday I decided to have overnight shipping. The lens arrived at 10 am on Friday(thanks UPS!) and was on my camera in 5 minutes. The lens was $189 after rebate!
This lens will never leave my camera! Walking around the car show I got many different shots from standing in one place. The lens performed very well. Soon I was in the habit of having the lens focus twice and it was worth the extra thought. Later that night when I went through the photos, I could not believe I took the photos. Crisp and clear with varying angles due to the flexibility in zoom. The wide angle end was exceptional in taking engine shots. Wall to wall engine and sparkling clear.Read more ›
Most Recent Customer Reviews
I bought this lens used, and its great. Able to get in close and zoom in on distant subjects. The Zoom ring is a little loose, it tends to slide a bit when I shoot downward, but... Read morePublished 18 hours ago by charlie
very good lens and great performance for an incredible pricePublished 4 days ago by Gil Fernan Gonzalez
Item arrives on time. Service is excellent & courteous. The Tamron Auto Focus is great product. Like it very much.Published 5 days ago by Chau Do
Used with a Pentax K-500. I used this lens on a recent cruise and took about 400 pics indoor and outdoor. While not the sharpest they were acceptable. Read morePublished 8 days ago by Smitty
The lens produced blurry images on nearly 75% of the images that it captured. There were some that turned out great and having the ability to have one lens that took the place of... Read morePublished 9 days ago by Andy Vogt
I purchased this as a gift for someone who had previously owned one of these. Theirs was dropped and damaged, and they wanted the same lens again, so one must suspect it was... Read morePublished 11 days ago by Warren Hargis
item arrived earlier than expected. It came with all the bells and whistles too!Published 14 days ago by Marc H.