Tokina AF 193 19-35 mm f/3.5-4.5
3. Build quality
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The solidity and certain roughness of the barrel (although it sounds perhaps too negative) didn’t influence the dimensions and the weight of the Tokina. The lens is smaller than its competitors from Canon, Tamron or Sigma, as you can check it yourself in the photo below, positioned near the Tamron 17-35 mm. The weight of the Tokina is comparable to the weight of this class lenses from other producers.
The same can be said about the inner construction. Tokina decided to use 13 elements positioned in 11 groups. The producer indicates that at least one element was made of high-refraction, low-dispersion (HLD) glass
Additionally, the Tokina 19-35 mm is equipped with inner focusing system and aperture change so when you zoom the lens and set its focus the outer dimensions don’t change and the front element doesn’t rotate, allowing you to work comfortably using filters of different kinds.