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 Tamron 11-20mm F2.8 A 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. Tamron 11-20mm F2.8 A is the longer of the two lenses at 86mm. The Sigma 20mm F2 DG DN C with a length of 72mm, is 14mm shorter. Besides being longer, the Tamron 11-20mm F2.8 A also has a larger diameter of 73mm compared to the Sigma 20mm F2 DG DN C's 70mm diameter.
Below you can find a scaled side-by-side image of Sigma 20mm F2 DG DN C and Tamron 11-20mm F2.8 A to get a better idea of how their sizes compare in real life.
Comparison image of the Sigma 20mm F2 DG DN C and the Tamron 11-20mm F2.8 A 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. Tamron 11-20mm F2.8 A weighs 335g, 9% (35g) 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 Tamron 11-20mm F2.8 A 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 62mm filters that we recommend you to consider for the Sigma 20mm F2 DG DN C:
And these are the 67mm filters that we recommend for the Tamron 11-20mm F2.8 A:
Lens Mounts
Both the Sigma 20mm F2 DG DN C and the Tamron 11-20mm F2.8 A has the same Sony E lens mount . Some of the latest released cameras that are compatible with the Sony E lenses are Sony FX5 , Sony A7R VI and Sony A7 V .
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 Tamron 11-20mm F2.8 A has a focal range of 11-20mm and 1.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 16.5-30mm when used on a APS-C / DX format camera.
