The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon 28mm f1.8 USM and the Samyang T-S 24mm f3.5 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. Samyang T-S 24mm f3.5 is the longer of the two lenses at 112mm. The Canon 28mm f1.8 USM with a length of 56mm, is 56mm shorter. Besides being longer, the Samyang T-S 24mm f3.5 also has a larger diameter of 86mm compared to the Canon 28mm f1.8 USM's 74mm 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. Canon 28mm f1.8 USM weighs 310g, which means it is 370g (54%) lighter than the Samyang T-S 24mm f3.5 which has a weight of 680g.
Filter Threads
The Canon 28mm f1.8 USM has a filter size of 58mm whereas the Samyang T-S 24mm f3.5 has a 82mm 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 Canon 28mm f1.8 USM:
And these are the 82mm filters that we recommend for the Samyang T-S 24mm f3.5:
Lens Mounts
Both the Canon 28mm f1.8 USM and the Samyang T-S 24mm f3.5 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.
Samyang T-S 24mm f3.5 is also available in Nikon F (FX) , Pentax KAF, Sony Alpha and Sony E mounts.
Focal Range
Canon 28mm f1.8 USM 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 Samyang T-S 24mm f3.5 is a prime lens with fixed focal lenght of 24mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 38.4mm.