The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Pentax 12-24mm F4.0 ED AL and the Sigma 12-24mm F4.5-5.6 EX DG HSM 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 12-24mm F4.5-5.6 EX DG HSM is the longer of the two lenses at 103mm. The Pentax 12-24mm F4.0 ED AL with a length of 84mm, is 19mm shorter. On the other hand, the Pentax 12-24mm F4.0 ED AL has a larger diameter of 88mm compared to the Sigma 12-24mm F4.5-5.6 EX DG HSM's 87mm 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. Pentax 12-24mm F4.0 ED AL weighs 430g, which means it is 170g (28%) lighter than the Sigma 12-24mm F4.5-5.6 EX DG HSM which has a weight of 600g.
Below you can find the dimension and weight table of the Wideangle Zoom Lenses in Pentax KAF Mount for size comparison purposes.
Ultra-Wideangle Lenses in Pentax KAF Mount for Size Comparison
Lens Mounts
Both the Pentax 12-24mm F4.0 ED AL and the Sigma 12-24mm F4.5-5.6 EX DG HSM has the same Pentax KAF lens mount. Some of the latest released cameras that are compatible with the Pentax KAF lenses are Pentax K-3 III Monochrome, Pentax KF and Pentax K-3 III.
Sigma 12-24mm F4.5-5.6 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
12-24mm but while Pentax 12-24mm F4.0 ED AL has the fastest aperture of
F4.0, the Sigma 12-24mm F4.5-5.6 EX DG HSM's widest aperture value is
F4.5 - F5.6.