The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 70mm F2.8 EX DG Macro and the Pentax 70mm F2.4 AL L 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 70mm F2.8 EX DG Macro is the longer of the two lenses at 95mm. The Pentax 70mm F2.4 AL L with a length of 26mm, is 69mm shorter. Besides being longer, the Sigma 70mm F2.8 EX DG Macro also has a larger diameter of 76mm compared to the Pentax 70mm F2.4 AL L's 63mm 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 70mm F2.4 AL L weighs 130g, 75% (397g) lighter than the Sigma 70mm F2.8 EX DG Macro's weight of 527g.
Lens Mounts
Both the Sigma 70mm F2.8 EX DG Macro and the Pentax 70mm F2.4 AL L 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 70mm F2.8 EX DG Macro is also available in Canon EF , Nikon F (FX), Sony Alpha and Sigma SA mounts.
Pentax 70mm F2.4 AL L is also available in Pentax KAF mount.
Focal Range
Both lenses have the same focal range of
70mm but while Sigma 70mm F2.8 EX DG Macro has the fastest aperture of
F2.8, the Pentax 70mm F2.4 AL L's widest aperture value is
F2.4.