Size and Weight Comparison The size of a lens is a crucial factor to consider when comparing two lenses. Tamron 20-40mm F2.8 VXD is the longer of the two lenses at 86mm. The Sigma 17mm F4 DG DN C with a length of 51mm, is 35mm shorter. Besides being longer, the Tamron 20-40mm F2.8 VXD also has a larger diameter of 74mm 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 Tamron 20-40mm F2.8 VXD 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 Tamron 20-40mm F2.8 VXD 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 145g (39%) lighter than the Tamron 20-40mm F2.8 VXD which has a weight of 365g.
Filter Threads
The Sigma 17mm F4 DG DN C has a filter size of 55mm whereas the Tamron 20-40mm F2.8 VXD 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 55mm filters that we recommend you to consider for the Sigma 17mm F4 DG DN C:
And these are the 67mm filters that we recommend for the Tamron 20-40mm F2.8 VXD:
Lens Mounts
Both the Sigma 17mm F4 DG DN C and the Tamron 20-40mm F2.8 VXD 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 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 Tamron 20-40mm F2.8 VXD has a focal range of 20-40mm and 2.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 30 - 60mm .
