Pros:
* solidly looking barrel,
* good image quality in the frame centre on slight stopping down,
* distortion less bothersome than in the case of most of competitors,
* slight chromatic aberration in the middle of the focal lengths range,
* good work of focusing mechanism.
Cons:
* significant zoom ring backlash,
* very weak image quality at the maximum relative aperture,
* 135 mm focal length not quite useful,
* significant chromatic aberration at both focal range ends,
* high vignetting at the wide angle,
* noticeable astigmatism,
* minimum focus amounts to as many as 0.5 meter,
* bad price/possibilities ratio.
........The Tokina 16.5–135 mm,
with such a weak performance at the maximum aperture and such chromatic aberration results at the wide angle, has rather slim chances of getting a good position on the market now. Its focal lengths’ range, undoubtedly interesting, is its only asset and it might prove to be definitely not enough.