The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 35mm f1.4 II and the Tamron 20-40mm F2.8 VXD 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 35mm f1.4 II is the longer of the two lenses at 96mm. The Tamron 20-40mm F2.8 VXD with a length of 86mm, is 10mm shorter. On the other hand, the Tamron 20-40mm F2.8 VXD has a larger diameter of 74mm compared to the Sigma 35mm f1.4 II's 73mm diameter.
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 20-40mm F2.8 VXD weighs 365g, 30% (160g) lighter than the Sigma 35mm f1.4 II's weight of 525g.
Filter Threads
Both the Sigma 35mm f1.4 II and the Tamron 20-40mm F2.8 VXD have the same Filter thread size of 67mm.
Below are links to the 67mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Sigma 35mm f1.4 II 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.
Sigma 35mm f1.4 II is also available in the Leica L mount.
Focal Range
Sigma 35mm f1.4 II is a prime lens with fixed focal lenght of 35mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
52.5mm.
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.
