The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 24mm F1.8 EX DG and the Tamron AF 28-80mm f3.5-5.6 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 24mm F1.8 EX DG is the longer of the two lenses at 83mm. The Tamron AF 28-80mm f3.5-5.6 with a length of 70mm, is 13mm shorter. Besides being longer, the Sigma 24mm F1.8 EX DG also has a larger diameter of 84mm compared to the Tamron AF 28-80mm f3.5-5.6's 72mm 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 AF 28-80mm f3.5-5.6 weighs 237g, 52% (263g) lighter than the Sigma 24mm F1.8 EX DG's weight of 500g.
Filter Threads
The Sigma 24mm F1.8 EX DG has a filter size of 77mm whereas the Tamron AF 28-80mm f3.5-5.6 has a 58mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 77mm filters that we recommend you to consider for the Sigma 24mm F1.8 EX DG:
And these are the 58mm filters that we recommend for the Tamron AF 28-80mm f3.5-5.6:
Lens Mounts
Both the Sigma 24mm F1.8 EX DG and the Tamron AF 28-80mm f3.5-5.6 has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon 1D X III, Canon 6D MII and Canon 5D MIV.
Sigma 24mm F1.8 EX DG is also available in Canon EF , Nikon F (FX), Four Thirds, Pentax KAF, Sony Alpha, Sigma SA, Pentax KAF, Sony Alpha, Sigma SA and Nikon F (FX) mounts.
Tamron AF 28-80mm f3.5-5.6 is also available in Nikon F (FX) , Sony Alpha and Pentax KAF mounts.
Focal Range
Sigma 24mm F1.8 EX DG is a prime lens with fixed focal lenght of 28mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
44.8mm.
On the other hand, the Tamron AF 28-80mm f3.5-5.6 has a focal range of 28-80mm and 2.9X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 44.8 - 128mm.