The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 20-40mm F2.8 VXD and the Rokinon 35mm f1.4 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. Rokinon 35mm f1.4 is the longer of the two lenses at 112mm. The Tamron 20-40mm F2.8 VXD with a length of 86mm, is 26mm shorter. On the other hand, the Tamron 20-40mm F2.8 VXD has a larger diameter of 74mm compared to the Rokinon 35mm f1.4's 63mm 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, which means it is 295g (44%) lighter than the Rokinon 35mm f1.4 which has a weight of 660g.
Filter Threads
The Tamron 20-40mm F2.8 VXD has a filter size of 67mm whereas the Rokinon 35mm f1.4 has a 77mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 67mm filters that we recommend you to consider for the Tamron 20-40mm F2.8 VXD:
And these are the 77mm filters that we recommend for the Rokinon 35mm f1.4:
Lens Mounts
The Tamron 20-40mm F2.8 VXD has the Sony E lens mount whereas the Rokinon 35mm f1.4 has the Pentax KAF lens mount. Some of the latest released cameras that are compatible with these mounts are Sony FX5, Sony A7R VI and Sony A7 V for the Sony E Mount and Pentax K-3 III Mono, Pentax KF and Pentax K-3 III for the Pentax KAF Mount.
Rokinon 35mm f1.4 is also available in Canon EF , Nikon F (FX), Four Thirds, Sony Alpha and Samsung NX mounts.
Focal Range
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.
On the other hand, the Rokinon 35mm f1.4 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.
