The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Pentax D FA 150-450mm F4.5-5.6 ED DC AW and the Sigma 150-600mm F5-6.3 DG OS HSM C 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 150-600mm F5-6.3 DG OS HSM C is the longer of the two lenses at 290mm. The Pentax D FA 150-450mm F4.5-5.6 ED DC AW with a length of 242mm, is 48mm shorter. Besides being longer, the Sigma 150-600mm F5-6.3 DG OS HSM C also has a larger diameter of 121mm compared to the Pentax D FA 150-450mm F4.5-5.6 ED DC AW's 95mm 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 150-600mm F5-6.3 DG OS HSM C weighs 1930g, 3% (70g) lighter than the Pentax D FA 150-450mm F4.5-5.6 ED DC AW's weight of 2000g.
Filter Threads
The Pentax D FA 150-450mm F4.5-5.6 ED DC AW has a filter size of 86mm whereas the Sigma 150-600mm F5-6.3 DG OS HSM C has a 95mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 86mm filters that we recommend you to consider for the Pentax D FA 150-450mm F4.5-5.6 ED DC AW:
And these are the 95mm filters that we recommend for the Sigma 150-600mm F5-6.3 DG OS HSM C:
Lens Mounts
The Pentax D FA 150-450mm F4.5-5.6 ED DC AW has the Pentax KAF3 lens mount whereas the Sigma 150-600mm F5-6.3 DG OS HSM C has the Nikon F (FX) lens mount. Some of the latest released cameras that are compatible with these mounts are Pentax K-3 III Mono, Pentax KF and Pentax K-3 III for the Pentax KAF3 Mount and Nikon D6, Nikon D780 and Nikon D3500 for the Nikon F (FX) Mount.
Sigma 150-600mm F5-6.3 DG OS HSM C is also available in Canon EF , Sigma SA and Sony Alpha mounts.
Focal Range
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.
On the other hand, the Sigma 150-600mm F5-6.3 DG OS HSM C has a focal range of 150-600mm and 4.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 225 - 900mm.
