The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 150-500mm F5-6.3 DG OS HSM and the Pentax D FA 150-450mm F4.5-5.6 ED DC AW 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. Sigma 150-500mm F5-6.3 DG OS HSM is the longer of the two lenses at 252mm. The Pentax D FA 150-450mm F4.5-5.6 ED DC AW with a length of 242mm, is 10mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 95mm.
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 150-500mm F5-6.3 DG OS HSM weighs 1780g, which means it is 220g (10%) lighter than the Pentax D FA 150-450mm F4.5-5.6 ED DC AW which has a weight of 2000g.
Below you can find the dimension and weight table of the Telephoto Zoom Lenses in Pentax KAF3 Mount for size comparison purposes.
Super Telephoto Lenses in Pentax KAF3 Mount for Size Comparison
Filter Threads
Both the Sigma 150-500mm F5-6.3 DG OS HSM and the Pentax D FA 150-450mm F4.5-5.6 ED DC AW have the same Filter thread size of 86mm.
Below are links to the 86mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Sigma 150-500mm F5-6.3 DG OS HSM and the Pentax D FA 150-450mm F4.5-5.6 ED DC AW has the same Pentax KAF3 lens mount. Some of the latest released cameras that are compatible with the Pentax KAF3 lenses are Pentax K-3 III Monochrome, Pentax KF and Pentax K-3 III.
Sigma 150-500mm F5-6.3 DG OS HSM is also available in Canon EF , Nikon F (FX), Sony Alpha and Sigma SA mounts.
Focal Range
Sigma 150-500mm F5-6.3 DG OS HSM has a focal range of 150-500mm and
3.3X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
225 - 750mm.
On the other hand, the Pentax D FA 150-450mm F4.5-5.6 ED DC AW has a focal range of 150-450mm and 3.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 225 - 675mm.