Tamron AF 18-250 mm f/3.5-6.3 Di II LD Aspherical (IF) review - Chromatic aberration

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Tamron AF 18-250 mm f/3.5-6.3 Di II LD Aspherical (IF)

21 August 2009

Arkadiusz Olech

5. Chromatic aberration

When it comes to chromatic aberration, the tested lens didn’t deserve any praise. Near the maximum relative aperture at all focal lengths the aberration is placed in the range from almost 0.12% to almost 0.16% so on the borderline between the medium and high level. At shorter focal lengths the aberration decreases on stopping down but not as quick as we would like. At maximum focal length the aperture closing doesn’t make things better – the aberration is high no matter what relative aperture we use.

Tamron AF 18-250 mm f/3.5-6.3 Di II LD Aspherical (IF) - Chromatic aberration

How Tamron fares compared to other lenses in this class? Once again the performance is weak! What’s interesting, the Tamron’s 18-270 VC aberration is similar only at the maximum aperture – for almost all other aperture/focal length combinations the stabilized cousin had better results! The Sigma 18-200 OS fared quite differently. In this case, the aberration was in the 0.08 to 0.14% bracket, practically constant at any given focal length and independent from the aperture value.

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