The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon 18-135mm f3.5-5.6 IS and the Tokina 16.5-135mm f3.5-5.6 DX for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Canon 18-135mm f3.5-5.6 IS is the longer of the two lenses at 101mm. The Tokina 16.5-135mm f3.5-5.6 DX with a length of 78mm, is 23mm shorter. On the other hand, the Tokina 16.5-135mm f3.5-5.6 DX has a larger diameter of 84mm compared to the Canon 18-135mm f3.5-5.6 IS's 75mm diameter.
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Canon 18-135mm f3.5-5.6 IS weighs 455g, which means it is 155g (25%) lighter than the Tokina 16.5-135mm f3.5-5.6 DX which has a weight of 610g.
Filter Threads
The Canon 18-135mm f3.5-5.6 IS has a filter size of 67mm whereas the Tokina 16.5-135mm f3.5-5.6 DX has a 77mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 67mm filters that we recommend you to consider for the Canon 18-135mm f3.5-5.6 IS:
And these are the 77mm filters that we recommend for the Tokina 16.5-135mm f3.5-5.6 DX:
Lens Mounts
The Canon 18-135mm f3.5-5.6 IS has the Canon EF-S lens mount whereas the Tokina 16.5-135mm f3.5-5.6 DX has the Canon EF lens mount. Some of the latest released cameras that are compatible with these mounts are Canon T8i, Canon 90D and Canon SL3 for the Canon EF-S Mount and Canon T8i, Canon 90D and Canon SL3 for the Canon EF Mount.
Canon 18-135mm f3.5-5.6 IS is also available in Canon EF-S mount.
Tokina 16.5-135mm f3.5-5.6 DX is also available in Nikon F (DX) mount.
Focal Range
Canon 18-135mm f3.5-5.6 IS has a focal range of 18-135mm and
7.5X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
28.8-216mm when used on a APS-C / DX format camera.
On the other hand, the Tokina 16.5-135mm f3.5-5.6 DX has a focal range of 17-135mm and 7.9X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27.2-216mm when used on a APS-C / DX format camera.