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 Sigma 17mm F4 DG DN C with a length of 51mm, is 21mm shorter. Besides being longer, the Sigma 20mm F2 DG DN C also has a larger diameter of 70mm compared to the Sigma 17mm F4 DG DN C's 64mm diameter.
Below you can find a scaled side-by-side image of Sigma 17mm F4 DG DN C and Sigma 20mm F2 DG DN C to get a better idea of how their sizes compare in real life.
Comparison image of the Sigma 17mm F4 DG DN C and the Sigma 20mm F2 DG DN C Size and Weight 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 17mm F4 DG DN C weighs 220g, which means it is 150g (40%) lighter than the Sigma 20mm F2 DG DN C which has a weight of 370g.
Filter Threads
The Sigma 17mm F4 DG DN C has a filter size of 55mm whereas the Sigma 20mm F2 DG DN C 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 55mm filters that we recommend you to consider for the Sigma 17mm F4 DG DN C:
And these are the 62mm filters that we recommend for the Sigma 20mm F2 DG DN C:
Lens Mounts
The Sigma 17mm F4 DG DN C has the Sony E lens mount whereas the Sigma 20mm F2 DG DN C has the Leica L lens mount . Some of the latest released cameras that are compatible with these mounts are Sony FX5 , Sony A7R VI and Sony A7 V for the Sony E Mount and Leica SL3-P , Panasonic S1 II and Panasonic S1 IIE for the Leica L Mount.
Sony E mount.
Focal Range
Sigma 17mm F4 DG DN C is a prime lens with fixed focal lenght of 17mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
25.5mm .
On the other hand, the 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 .
