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Tamron 17-50mm F/2.8 XR Di II LD Aspherical [IF]

1750diII
Review Date: Mar 15, 2007 Recommend? yes | Price paid: Not Indicated | Rating: 6 

 
Pros: Very sharp out of camera, great value for f2.8, sturdy built, none of the sigma coating, free lens hood, Great rubber grip,
Cons:
Zoom ring gearing is long, takes many turns from 17 to 50, miss balanced inner elements, left-right sharpness not equal, horrid technical support,

Had 2 copies of this lens, both had the misaligned inner lens.
The left-right sharpness of image is not the same.
If the left is sharp , the right would be blurry etc.

Mine was "assembled in China" not made in China Smile

misalignment is very obvious at f2.8, somewhat acceptable at
f5.6. This shows it self more for group shots or people who like to take pics of wall etc.

Still useable.

Image is sharp and contrasty, focus very close around till 4 in away. Good zoom grip and good AF switch over. NOne of the sigma double action thing.

Sturdy build ( ABS engineering plastic ), no Sigma's peel-off-coating, pretty light.

AF is fast enough but slightly slower than Sigma 18-50. Although it's louder but AF accuracy is better in the Tamron.

Yes, AF makes some sound but I never bothered with the sound, dont know why its some people's major concern.

Anycase, if you intend to get one, test it properly at the shop.
Technical support is nonexistence.....