The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Pentax 17-70mm F4.0 AL SDM and the Sony E 16-70mm F4 ZA OSS 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. Pentax 17-70mm F4.0 AL SDM is the longer of the two lenses at 94mm. The Sony E 16-70mm F4 ZA OSS with a length of 75mm, is 19mm shorter. Besides being longer, the Pentax 17-70mm F4.0 AL SDM also has a larger diameter of 75mm compared to the Sony E 16-70mm F4 ZA OSS's 67mm 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. Sony E 16-70mm F4 ZA OSS weighs 308g, 36% (177g) lighter than the Pentax 17-70mm F4.0 AL SDM's weight of 485g.
Filter Threads
The Pentax 17-70mm F4.0 AL SDM has a filter size of 67mm whereas the Sony E 16-70mm F4 ZA OSS has a 55mm 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 17-70mm F4.0 AL SDM:
And these are the 55mm filters that we recommend for the Sony E 16-70mm F4 ZA OSS:
Lens Mounts
The Pentax 17-70mm F4.0 AL SDM has the Pentax KAF3 lens mount whereas the Sony E 16-70mm F4 ZA OSS has the Sony E lens mount. Some of the latest released cameras that are compatible with these mounts are , and for the Pentax KAF3 Mount and Sony ZV-E10 II, Sony A6700 and Sony FX30 for the Sony E Mount.
Focal Range
Pentax 17-70mm F4.0 AL SDM has a focal range of 17-70mm and
4.1X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
25.5-105mm when used on a APS-C / DX format camera.
On the other hand, the Sony E 16-70mm F4 ZA OSS has a focal range of 16-70mm and 4.4X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 24-105mm when used on a APS-C / DX format camera.
