Tamron SP 70-300 mm f/4-5.6 Di VC USD review - Coma and astigmatism

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Tamron SP 70-300 mm f/4-5.6 Di VC USD

4 February 2011

Arkadiusz Olech

7. Coma and astigmatism

Coma will be noticeable only at the shortest focal length. After passing to the 135-200 mm range this aberration decreases significantly and disappears completely at 300 mm. Here the lens’s performance can be assessed positively. It is an interesting fact that the Sigma 70-300 mm OS had exactly the same results in this category.

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Tamron SP 70-300 mm f/4-5.6 Di VC USD - Coma and astigmatism

The solid and quite heavy barrel for this class of equipment seems to keep the elements firmly on their places so they don’t lean toward the axis during zooming and/or focusing. That’s why the lens doesn’t have any problems with the astigmatism correction. The average difference between horizontal and vertical MTF50 values amounted to 5.1% which is a very good result.