The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 70-180mm F2.8 Di G2 and the Pentax DA 60-250mm F4.0 ED 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 DA 60-250mm F4.0 ED is the longer of the two lenses at 168mm. The Tamron 70-180mm F2.8 Di G2 with a length of 157mm, is 11mm shorter. On the other hand, the Tamron 70-180mm F2.8 Di G2 has a larger diameter of 83mm compared to the Pentax DA 60-250mm F4.0 ED's 82mm 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. Tamron 70-180mm F2.8 Di G2 weighs 855g, which means it is 185g (17%) lighter than the Pentax DA 60-250mm F4.0 ED which has a weight of 1040g.
Filter Threads
Both the Tamron 70-180mm F2.8 Di G2 and the Pentax DA 60-250mm F4.0 ED have the same Filter thread size of 67mm.
Below are links to the 67mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Tamron 70-180mm F2.8 Di G2 has the Sony E lens mount whereas the Pentax DA 60-250mm F4.0 ED has the Pentax KAF2 lens mount. Some of the latest released cameras that are compatible with these mounts are Sony FX5, Sony A7R VI and Sony A7 V for the Sony E Mount and , and for the Pentax KAF2 Mount.
Tamron 70-180mm F2.8 Di G2 is also available in the Nikon Z mount.
Focal Range
Tamron 70-180mm F2.8 Di G2 has a focal range of 70-180mm and
2.6X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
105 - 270mm.
On the other hand, the Pentax DA 60-250mm F4.0 ED has a focal range of 60-250mm and 4.2X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 90-375mm when used on a APS-C / DX format camera.
