The type of photography that you are planning to use is an important decision factor. Here we have evaluated the PENTAX28-105mm F3.5-5.6 WR and the Pentax D FA 24-70mm F2.8 ED SDM WR 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 24-70mm F2.8 ED SDM WR is the longer of the two lenses at 110mm. The PENTAX28-105mm F3.5-5.6 WR with a length of 87mm, is 23mm shorter. Besides being longer, the Pentax D FA 24-70mm F2.8 ED SDM WR also has a larger diameter of 89mm compared to the PENTAX28-105mm F3.5-5.6 WR's 73mm diameter.
Below you can find a scaled side-by-side image of PENTAX28-105mm F3.5-5.6 WR and Pentax D FA 24-70mm F2.8 ED SDM WR to get a better idea of how their sizes compare in real life.
Comparison image of the PENTAX28-105mm F3.5-5.6 WR and the Pentax D FA 24-70mm F2.8 ED SDM WR Size and Weight 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. PENTAX28-105mm F3.5-5.6 WR weighs 440g, which means it is 347g (44%) lighter than the Pentax D FA 24-70mm F2.8 ED SDM WR which has a weight of 787g.
Below you can find the dimension and weight table of the Standard Zoom Lenses in Pentax KAF3 Mount for size comparison purposes.
Standard Pentax KAF3 Mount
Lens Mounts
Both the PENTAX28-105mm F3.5-5.6 WR and the Pentax D FA 24-70mm F2.8 ED SDM WR 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 Mono , Pentax KF and Pentax K-3 III .
Focal Range
PENTAX28-105mm F3.5-5.6 WR has a focal range of 28-105mm and
3.8X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
42 - 157.5mm .
On the other hand, the Pentax D FA 24-70mm F2.8 ED SDM WR has a focal range of 24-70mm 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 36 - 105mm .
