The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon 17-55mm f2.8 IS USM and the Pentax D FA 24-70mm F2.8 ED SDM WR 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 17-55mm f2.8 IS USM is the longer of the two lenses at 111mm. The Pentax D FA 24-70mm F2.8 ED SDM WR with a length of 110mm, is 1mm shorter. On the other hand, the Pentax D FA 24-70mm F2.8 ED SDM WR has a larger diameter of 89mm compared to the Canon 17-55mm f2.8 IS USM's 84mm 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 17-55mm f2.8 IS USM weighs 645g, which means it is 142g (18%) lighter than the Pentax D FA 24-70mm F2.8 ED SDM WR which has a weight of 787g.
Lens Mounts
The Canon 17-55mm f2.8 IS USM has the Canon EF-S lens mount whereas the Pentax D FA 24-70mm F2.8 ED SDM WR has the Pentax KAF3 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 Pentax K-3 III Mono, Pentax KF and Pentax K-3 III for the Pentax KAF3 Mount.
Focal Range
Canon 17-55mm f2.8 IS USM has a focal range of 17-55mm and
3.2X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
27.2-88mm when used on a APS-C / DX format camera.
On the other hand, the Pentax D FA 24-70mm F2.8 ED SDM WR has a focal range of 24-70mm and 2.9X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 36 - 105mm.
