Đánh giá tamron 18 200 sony năm 2024
(From Tamron lens literature) At Tamron, our quest has always been to make the ideal zoom lens. As a result of this ongoing challenge, we have introduced the concept of our high-power zoom lens in the new AF 18-200mm 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. Note: PMA, January 31, 2008, Las Vegas, NV -- Mr. Morio Ono, president and CEO of Tamron Co., Ltd., announced that the company has developed AF18-200mm F/3.5-6.3 XR Di II (model A14) with a Built-In Motor for Nikon. Test Notes Super-long ratio zoom lenses have often been called "vacation lenses", since they're the ideal solution when you're traveling, and only want to bring one lens along. Tamron has long had a history of making some of the better ultra-zoom lenses out there, and this current 18-200mm matches their long-zoom prowess to the needs of the digital market. Thanks to its reduced image circle (it's designed for cameras with APS-C size sensors), the 18-200 is surprisingly compact, given its incredible zoom range. (For reference, this lens is the equivalent of a 27-300mm lens on a 35mm SLR.) Of course, there's never a free lunch, and in the case of long-zoom lenses, this means that tradeoffs inevitably have to be made. For the Tamron 18-200, the tradeoff is that it is significantly soft in the corners and edges when shooting wide open, pretty much across the focal length range. As always though, closing the aperture down a stop or two makes a big difference. At 18mm, shooting between f/5.6 and f/8 delivers pretty impressive sharpness, but you'll have to go to f/16 for the best results at 50mm, and to f/11 at 100-200mm. Even stopped down though, this lens is a little soft at 200mm. Chromatic aberration is high at both ends of the zoom range (wide and telephoto), but is actually quite low over a broad range of medium focal lengths. Vignetting is very low, with a maximum of about 1/3 stop at wide angle and maximum aperture. Stopped down to f/5.6, it's never more than 1/4 stop, and often quite a bit lower. Distortion covers quite a range, from about 1% barrel at 18mm, to about 0.6% pincushion at 50mm, finally decreasing to about 0.4% at 200mm. When calculating the bottom line for this lens, it's important to consider its intended market, and its very affordable price point. Can you do better with multiple, more expensive lenses? Without question. But if space and convenience are overriding concerns on a long trip, softer images may be an acceptable price to pay. Possibly even more important than the sheer convenience factor though, is the security of not having to worry about dust entering your camera body as you swap lenses on and off in less-than-pristine environments. - This is actually a fairly serious issue with digital SLRs, as dust on the sensor will show up in every shot you take, and your ability to clean your camera's sensor is likely to be severely limited while traveling. So here's the bottom line: If you need to just put one lens on your camera and leave it there, yet still want to cover a focal length range from wide angle to a fairly long tele, this lens is a good, affordable solution. NOTE: We've now posted a test of this lens' successor, the Tamron 18-250mm f/3.5-6.3 Di II LD Aspherical IF Macro AF. This new model significantly outperforms the 18-200mm, albeit for a street price that's about $100 higher -- so you may want to consider that newer model if you're in the "Vacation Lens" market. The 18-250mm review also compares and contrasts that lens with all the other long-ratio zooms on the market, making it a good point of reference if you're shopping for a lens of this type. Check it out! Tamron18-200mm f/3.5-6.3 XR Di II LD Aspherical IF AFTamron 18-200mm f/3.5-6.3 XR Di II LD Aspherical IF AF User Reviews7.2/10average of 9 review(s) Build Quality7.6/10 Image Quality7.6/10
8 out of 10 pointsand recommended by DARKSUN (1 reviews) Great Price, Good Range, Zoom Lock., Great sharpness Noisy motor, slower than average AF. I recently upgraded from my Kit 18-55 nikon lens to this all in one zoom, and I must say, I love it. It was within my budget and I get to have a all-in-one solution. Now I no longer have to chnage between my old 18-55 and 55-200 anymore. (worried about dust. etc) Sure the Nikon Vr 18-200 is better, But not everone has the money to pay 2X the amount i paid for this lens to do the Job. On my D50 and my brother's D70s, it works flawlessly. I especially love the barrel lock to prevent creeping when I am holding facing downwards and it comes COMPLETE with Flower Hood and all caps, and a 6 year warranty. |