The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 100mm F2.8 STF GM and the Tamron 90mm f2.8 Macro 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. Sony FE 100mm F2.8 STF GM is the longer of the two lenses at 118mm. The Tamron 90mm f2.8 Macro with a length of 97mm, is 21mm shorter. Besides being longer, the Sony FE 100mm F2.8 STF GM also has a larger diameter of 85mm compared to the Tamron 90mm f2.8 Macro'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 90mm f2.8 Macro weighs 405g, 42% (295g) lighter than the Sony FE 100mm F2.8 STF GM's weight of 700g.
Filter Threads
The Sony FE 100mm F2.8 STF GM has a filter size of 72mm whereas the Tamron 90mm f2.8 Macro has a 55mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 72mm filters that we recommend you to consider for the Sony FE 100mm F2.8 STF GM:
And these are the 55mm filters that we recommend for the Tamron 90mm f2.8 Macro:
Lens Mounts
The Sony FE 100mm F2.8 STF GM has the Sony E lens mount whereas the Tamron 90mm f2.8 Macro has the Nikon F (FX) 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 Nikon D6, Nikon D780 and Nikon D3500 for the Nikon F (FX) Mount.
Tamron 90mm f2.8 Macro is also available in Canon EF , Sony Alpha and Pentax KAF mounts.
Focal Range
Sony FE 100mm F2.8 STF GM is a prime lens with fixed focal lenght of 100mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
150mm.
On the other hand, the Tamron 90mm f2.8 Macro is a prime lens with fixed focal lenght of 90mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 135mm.
