（测评）适马50

Arkadiusz Olech  

11. Summary

Pros:

excellent image quality in the center for all apertures, very good image quality at the edge, very small chromatic aberration for medium focal lengths, properly corrected coma and astigmatism, high build quality, tripod collar and lens hood cap "in the box".

Cons:

glares when taking photos against bright light, AF not very accurate.

Very good image quality in the center and at the edge and good build quality are the biggest advantages of Tokina 50-135 mm. Even semi-pro photographer may think of buying it instead of some prime lenses with 50 to 135 mm focal lengths. Professional user can see difference between this tele zoom and primes but this difference is not big. For pro users the biggest drawback is that this lens will not work with full frame camera. Some people can be disappointed with AF behavior because it is significantly less accurate, slower and louder then its Canon, Nikon or even Sigma counterparts equipped with USM/SWM/HSM.  

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Test of Sigma 50-150 mm f/2.8 APO EX DC HSM

Arkadiusz Olech  

11. Summary

Adventages: excellent image resolution at the center, very good image resolution at the egde for 50 mm, small coma, no ghosting and flares, silent and fast autofocus, excellent built quality, small size.

Disadventages: poor image quality at the edge for 150 mm, chromatic abberation should be smaller in APO lens, noticable astigmatism for focal length range from 100 to 150 mm, clear vignetting especially at 150 mm, significant front-focus with Canon 20D.

So which lens you should choose? Sigma 70-200 f/2.8 or Sigma 50-150 f/2.8? First one has better optical performance, especially on APS-C/DX matrix. Astigmatism, vignetting and distortion are well controlled which is not in case of 50-150 model. But all in all advantage of 70-200 is not that big. Besides 50-150 mm is cheaper and much smaller and lighter. So if you do not plan to buy full frame camera you will not be disapointed if you choose Sigma 50-150 mm f/2.8 APO EX DC HSM.

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上面只quote了两段结论，原文有详细的分析和例图

SIGMA    http://www_optyczne_pl/index.php?art=51TOKINA   http://www_optyczne_pl/index.php?art=57

PS：50-135的Ghosting and flare超级严重......