LensTip.com

Lens review

Tamron AF 18-200 mm f/3.5-6.3 XR Di II LD Aspherical (IF)

12 January 2011
Arkadiusz Olech

6. Distortion

Geometric deformations at edges are often a problem of lenses with a wide focal range because in such constructions they are very difficult to correct. The Tamron 18-200 mm is not an exception to this rule and it would be difficult to find a focal lengths range in which the distortion is imperceptible.

The worst situation we see at 18 mm, where the level of this aberration reaches a very high value of –5.14%. The aberration starts to decrease very quickly, though, changes the sign and becomes pincushion. At 35 mm it amounts to 1.27%, at 50 mm it increases to 1.78% and then it starts decreasing again but very slowly. At 85 mm it is 1.59%, at 125 mm 1.28% and at 200 mm 1.17%. As we noticed before at no focal length the distortion decreased to an imperceptible level below 1%. The Nikkor 18-135 mm for example had a bit different problems in this category - at the widest angle its distortion level was lower than the Tamron’s (-4.6%) but at longer focal lengths the distortion was above 2% to the very end. The Tamron fared perhaps a bit better here, especially that, having a wider focal lengths range, its task was more difficult.

Tamron AF 18-200 mm f/3.5-6.3 XR Di II LD Aspherical (IF) - Distortion


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Tamron AF 18-200 mm f/3.5-6.3 XR Di II LD Aspherical (IF) - Distortion

Tamron AF 18-200 mm f/3.5-6.3 XR Di II LD Aspherical (IF) - Distortion