The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 50-150mm F2.8 EX DC OS HSM and the Pentax D FA 70-200mm F2.8ED 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 D FA 70-200mm F2.8ED is the longer of the two lenses at 203mm. The Sigma 50-150mm F2.8 EX DC OS HSM with a length of 198mm, is 5mm shorter. Besides being longer, the Pentax D FA 70-200mm F2.8ED also has a larger diameter of 92mm compared to the Sigma 50-150mm F2.8 EX DC OS HSM's 86mm 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. Sigma 50-150mm F2.8 EX DC OS HSM weighs 1350g, which means it is 405g (23%) lighter than the Pentax D FA 70-200mm F2.8ED which has a weight of 1755g.
Filter Threads
Both the Sigma 50-150mm F2.8 EX DC OS HSM and the Pentax D FA 70-200mm F2.8ED have the same Filter thread size of 77mm.
Below are links to the 77mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Sigma 50-150mm F2.8 EX DC OS HSM has the Canon EF lens mount whereas the Pentax D FA 70-200mm F2.8ED 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 Mount and Pentax K-3 III Mono, Pentax KF and Pentax K-3 III for the Pentax KAF3 Mount.
Sigma 50-150mm F2.8 EX DC OS HSM is also available in the Nikon F (DX) and Sigma SA mounts.
Focal Range
Sigma 50-150mm F2.8 EX DC OS HSM has a focal range of 50-150mm and
3.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
80-240mm when used on a APS-C / DX format camera.
On the other hand, the Pentax D FA 70-200mm F2.8ED has a focal range of 70-200mm 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 105 - 300mm.
