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 105mm 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 105mm F2.8 EX DG Macro with a length of 98mm, is 4mm shorter. On the other hand, the Sigma 105mm F2.8 EX DG Macro has a larger diameter of 74mm 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 105mm F2.8 EX DG Macro weighs 460g, 34% (240g) lighter than the Leica APO-SL 90mm F2 ASPH's weight of 700g.
Filter Threads
The Leica APO-SL 90mm F2 ASPH has a filter size of 67mm whereas the Sigma 105mm F2.8 EX DG Macro has a 62mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 67mm filters that we recommend you to consider for the Leica APO-SL 90mm F2 ASPH:
And these are the 62mm filters that we recommend for the Sigma 105mm F2.8 EX DG Macro:
Lens Mounts
The Leica APO-SL 90mm F2 ASPH has the Leica L lens mount whereas the Sigma 105mm F2.8 EX DG Macro has the Sony Alpha 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 Sony A99 II, Sony A68 and Sony A77 II for the Sony Alpha Mount.
Sigma 105mm F2.8 EX DG Macro is also available in Canon EF , Nikon F (FX), Pentax KAF, Sigma SA and Four Thirds 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 105mm F2.8 EX DG Macro is a prime lens with fixed focal lenght of 105mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 157.5mm.
