The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 20mm F2 DG DN C and the Sony E 35mm F1.8 OSS 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 20mm F2 DG DN C is the longer of the two lenses at 72mm. The Sony E 35mm F1.8 OSS with a length of 45mm, is 27mm shorter. Besides being longer, the Sigma 20mm F2 DG DN C also has a larger diameter of 70mm compared to the Sony E 35mm F1.8 OSS's 63mm diameter.
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Below you can find a scaled side-by-side image of Sigma 20mm F2 DG DN C and Sony E 35mm F1.8 OSS 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 E 35mm F1.8 OSS weighs 155g, 58% (215g) lighter than the Sigma 20mm F2 DG DN C's weight of 370g.
Filter Threads
The Sigma 20mm F2 DG DN C has a filter size of 62mm whereas the Sony E 35mm F1.8 OSS has a 49mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 62mm filters that we recommend you to consider for the Sigma 20mm F2 DG DN C:
And these are the 49mm filters that we recommend for the Sony E 35mm F1.8 OSS:
Lens Mounts
Both the Sigma 20mm F2 DG DN C and the Sony E 35mm F1.8 OSS has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony A9 III, Sony A7C Mark II and Sony A7CR.
Sigma 20mm F2 DG DN C is also available in Leica L mount.
Focal Range
Sigma 20mm F2 DG DN C is a prime lens with fixed focal lenght of 20mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
30mm.
On the other hand, the Sony E 35mm F1.8 OSS is a prime lens with fixed focal lenght of 35mm which has an effective (full-frame 35mm equivalent) focal range of 52.5mm when used on a APS-C / DX format camera.