The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 50mm F1.8 and the Tamron 18-270mm f3.5-6.3 II PZD 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 18-270mm f3.5-6.3 II PZD is the longer of the two lenses at 88mm. The Sony FE 50mm F1.8 with a length of 60mm, is 28mm shorter. Besides being longer, the Tamron 18-270mm f3.5-6.3 II PZD also has a larger diameter of 74mm compared to the Sony FE 50mm F1.8's 69mm 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. Sony FE 50mm F1.8 weighs 186g, which means it is 264g (58%) lighter than the Tamron 18-270mm f3.5-6.3 II PZD which has a weight of 450g.
Filter Threads
The Sony FE 50mm F1.8 has a filter size of 49mm whereas the Tamron 18-270mm f3.5-6.3 II PZD has a 62mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 49mm filters that we recommend you to consider for the Sony FE 50mm F1.8:
And these are the 62mm filters that we recommend for the Tamron 18-270mm f3.5-6.3 II PZD:
Lens Mounts
The Sony FE 50mm F1.8 has the Sony E lens mount whereas the Tamron 18-270mm f3.5-6.3 II PZD has the Sony Alpha 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 Sony A68, Sony A77 II and Sony A58 for the Sony Alpha Mount.
Focal Range
Sony FE 50mm F1.8 is a prime lens with fixed focal lenght of 50mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
75mm.
On the other hand, the Tamron 18-270mm f3.5-6.3 II PZD has a focal range of 18-270mm and 15.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-405mm when used on a APS-C / DX format camera.
