The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Pentax 16-45mm F4 ED AL and the Canon 16-35mm f2.8L II USM 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 16-35mm f2.8L II USM is the longer of the two lenses at 112mm. The Pentax 16-45mm F4 ED AL with a length of 92mm, is 20mm shorter. Besides being longer, the Canon 16-35mm f2.8L II USM also has a larger diameter of 89mm compared to the Pentax 16-45mm F4 ED AL's 72mm 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. Pentax 16-45mm F4 ED AL weighs 356g, which means it is 279g (43%) lighter than the Canon 16-35mm f2.8L II USM which has a weight of 635g.
Filter Threads
The Pentax 16-45mm F4 ED AL has a filter size of 67mm whereas the Canon 16-35mm f2.8L II USM has a 82mm 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 Pentax 16-45mm F4 ED AL:
And these are the 82mm filters that we recommend for the Canon 16-35mm f2.8L II USM:
Lens Mounts
The Pentax 16-45mm F4 ED AL has the Pentax 645AF2 lens mount whereas the Canon 16-35mm f2.8L II USM has the Canon EF lens mount. Some of the latest released cameras that are compatible with these mounts are , and for the Pentax 645AF2 Mount and Canon 1D X III, Canon 6D MII and Canon 5D MIV for the Canon EF Mount.
Focal Range
Pentax 16-45mm F4 ED AL has a focal range of 16-45mm and
2.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
24-67.5mm when used on a APS-C / DX format camera.
On the other hand, the Canon 16-35mm f2.8L II USM has a focal range of 16-35mm and 2.2X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 25.6 - 56mm.