The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 85mm F1.4 DG DN A and the Sony FE 85mm F1.8 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 85mm F1.4 DG DN A is the longer of the two lenses at 94mm. The Sony FE 85mm F1.8 with a length of 82mm, is 12mm shorter. Besides being longer, the Sigma 85mm F1.4 DG DN A also has a larger diameter of 83mm compared to the Sony FE 85mm F1.8's 78mm diameter.
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Below you can find a scaled side-by-side image of Sigma 85mm F1.4 DG DN A and Sony FE 85mm F1.8 to get a better idea of how their sizes compare in real life.
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. Sony FE 85mm F1.8 weighs 371g, 41% (259g) lighter than the Sigma 85mm F1.4 DG DN A's weight of 630g.
Filter Threads
The Sigma 85mm F1.4 DG DN A has a filter size of 77mm whereas the Sony FE 85mm F1.8 has a 67mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 77mm filters that we recommend you to consider for the Sigma 85mm F1.4 DG DN A:
And these are the 67mm filters that we recommend for the Sony FE 85mm F1.8:
Lens Mounts
The Sigma 85mm F1.4 DG DN A has the Leica L lens mount whereas the Sony FE 85mm F1.8 has the Sony E lens mount. Some of the latest released cameras that are compatible with these mounts are Leica SL3, Panasonic S5 II and Panasonic S5 II X for the Leica L Mount and Sony A9 III, Sony A7C Mark II and Sony A7CR for the Sony E Mount.
Focal Range
Both lenses have the same focal range of
85mm but while Sigma 85mm F1.4 DG DN A has the fastest aperture of
F1.4, the Sony FE 85mm F1.8's widest aperture value is
F1.8.