The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica APO-SL 90mm F2 ASPH and the Sigma 70mm F2.8 EX DG Macro 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. Leica APO-SL 90mm F2 ASPH is the longer of the two lenses at 102mm. The Sigma 70mm F2.8 EX DG Macro with a length of 95mm, is 7mm shorter. On the other hand, the Sigma 70mm F2.8 EX DG Macro has a larger diameter of 76mm compared to the Leica APO-SL 90mm F2 ASPH's 73mm 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 70mm F2.8 EX DG Macro weighs 527g, 24% (173g) lighter than the Leica APO-SL 90mm F2 ASPH's weight of 700g.
Lens Mounts
The Leica APO-SL 90mm F2 ASPH has the Leica L lens mount whereas the Sigma 70mm F2.8 EX DG Macro has the Pentax KAF lens mount. Some of the latest released cameras that are compatible with these mounts are Leica SL3-P, Panasonic S1 II and Panasonic S1 IIE for the Leica L Mount and Pentax K-3 III Mono, Pentax KF and Pentax K-3 III for the Pentax KAF Mount.
Sigma 70mm F2.8 EX DG Macro is also available in Canon EF , Nikon F (FX), Sony Alpha and Sigma SA mounts.
Focal Range
Leica APO-SL 90mm F2 ASPH is a prime lens with fixed focal lenght of 90mm.
On the other hand, the Sigma 70mm F2.8 EX DG Macro is a prime lens with fixed focal lenght of 70mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 105mm.
