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Tamron AF 18-270mm f/3.5-6.3 Di II VC PZD LD Aspherical IF Macro Zoom Lens with Built in Motor for Canon DSLR Cameras

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Chromatic aberrations are reasonably well controlled at shorter focal lengths, approaching and only just exceeding 1 pixel width at the edge of the frame. This will be barely noticeable, unless you go hunting for it. At 270mm, things get a little worse, approaching 2 pixels wide, which will be noticeable on closer examination. One and only problem I'm facing is sharpness. This is the most important factor of the photography. This lens is extremely bad in sharpness. Another issue is light. 18-270mm is good for outdoor with sunny day not for dawn/evening or even low sun light.

At 28mm, the center of the image frame remains reasonably sharp wide open, but the mid and corner areas of the frame are very soft. Autofocus is achieved via a motor built into the lens. It is not the silent (USM or HSM) type found on many modern zooms, so a noise can be heard during focusing. Focusing is fast and accurate at the wide-end of the zoom, but AF performance is less efficient as the lens is zoomed in, often hunting around in lower light conditions. The minimum focusing distance is 0.49metres (19.3in) throughout the zoom range, which is very close for a lens covering such a extreme focal length range. OPPO's mid-range smartphone aims to provide a sophisticated camera system at an attractive price. Andy Westlake sees how it measures up.

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The included plastic hood is small - and as usual with this class of lens, will not offer much protection against flare at longer focal lengths.

I spent far more days than I want to think about trying to create a set of outdoor image quality comparisons to show you in addition to the ISO 12233 Chart Tool results. Vignetting is generally very low - at worst there's slightly over a stop wide open at 18mm, which pretty well disappears on stopping down the F5.6. Overall this nothing to worry about in practical use. Distortion begins at 18mm as rather strong barrel distortion (moderately bulged-in-the-middle / wavy) A white dot on the outside of the hood aids alignment for mounting, and the hood reverses neatly for storage. Optical image stabilisation is built in and is more or less essential on a lens this long, with such a modest maximum aperture. An internal focusing mechanism means the 62mm filter thread doesn’t rotate, simplifying the use of polarising filters. The supplied petal-shaped hood fits via a bayonet mount and can be reversed neatly when the lens isn’t in use. Tamron 18-200mm f/3.5-6.3 Di II VC – Build and handlingIn this case, I carefully shot 651 shots handheld as motionless as possible - and then evaluated the results. If there’s one kind of lens that tends to get a bad press, it’s the all-in-one ‘superzoom’. Conventional wisdom states that zooms with a 3x range can be optically excellent, and 4x can still be very good, but extend that to 10x or more and the compromises become too great. Because of this, many enthusiast photographers feel they should shun superzooms on principle and instead use two zooms to cover the same focal-length range.

But thus far, I am not satisfied with how my test shots compare the complex image quality from these lenses. Like all SLR superzooms the 18-270mm suffers from pretty pronounced distortion. At wideangle there's quite strong barrel distortion (3.2%), with recorrection towards the corners. This turns to pincushion across the rest of the range, which is worst around 50mm (a rather severe -3.3%).

Ease of Use

At 270mm, the entire image is soft wide open and especially soft in the mid and corner areas of the frame. The optical formula of 16 elements in 14 groups includes one hybrid aspherical element and one low-dispersion glass element to reduce aberrations such as distortion and chromatic aberration. Other superzooms tend to use more special elements, and this undoubtedly helps explain the Tamron’s low cost. The Tamron 18-250mm carries a "Macro" designation, and it does surprisingly well at close focusing. The closest focus distance at 250mm is about 21cm (8 inches) from the subject to the front of the lens element, at which point it captures an area about 73mm (~2.9 inches) wide on our Canon EOS-20D test body. (A 1.6x crop factor camera.) That's a pretty small area, and the 8 inches of working distance would be very welcome in working with some subjects.

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