The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 15mm f1.4 DC C 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. Tamron 20-40mm F2.8 VXD is the longer of the two lenses at 86mm. The Sigma 15mm f1.4 DC C with a length of 65mm, is 21mm shorter. Besides being longer, the Tamron 20-40mm F2.8 VXD also has a larger diameter of 74mm compared to the Sigma 15mm f1.4 DC C's 64mm diameter.
Below you can find a scaled side-by-side image of Sigma 15mm f1.4 DC 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 15mm f1.4 DC 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 15mm f1.4 DC 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 15mm f1.4 DC C has a filter size of 58mm 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 58mm filters that we recommend you to consider for the Sigma 15mm f1.4 DC C:
And these are the 67mm filters that we recommend for the Tamron 20-40mm F2.8 VXD:
Lens Mounts
Both the Sigma 15mm f1.4 DC 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 ZV-E10 II , Sony A6700 and Sony FX30 .
Canon RF and Fujifilm X mounts.
Focal Range
Sigma 15mm f1.4 DC C is a prime lens with fixed focal lenght of 15mm which has an effective (full-frame 35mm equivalent) focal range of
22.5mm when used on a APS-C / DX format camera.
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 .
