The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Pentax D FA 24-70mm F2.8 ED SDM WR and the Sigma 24-70mm F2.8 EX DG HSM for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Pentax D FA 24-70mm F2.8 ED SDM WR is the longer of the two lenses at 110mm. The Sigma 24-70mm F2.8 EX DG HSM with a length of 95mm is 15mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 89mm.
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Pentax D FA 24-70mm F2.8 ED SDM WR weighs 787g, which means it is 3g (0%) lighter than the Sigma 24-70mm F2.8 EX DG HSM which has a weight of 790g.
Below you can find the dimension and weight table of the 'Standard Zoom Lenses in Pentax KAF3 Mount for size comparison purposes.
Standard Zoom Lenses in Pentax KAF3 Mount for Size Comparison
Lens Mounts
Both Pentax D FA 24-70mm F2.8 ED SDM WR and Sigma 24-70mm F2.8 EX DG HSM has the same Pentax KAF3 lens mount. Some of the latest released cameras that are compatible with the Pentax KAF3 lenses are Pentax KF, Pentax K-3 III and Pentax K-1 II.
Sigma 24-70mm F2.8 EX DG HSM is also available in Canon EF , Sony Alpha, Sigma SA and Nikon F (FX) mounts.
Focal Range
Both lenses have the same focal range of 24-70mm and the fastest aperture of F2.8.