The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 35mm F2.8 Di III OSD M1:2 and the Sigma 30mm F1.4 C 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 30mm F1.4 C is the longer of the two lenses at 73mm. The Tamron 35mm F2.8 Di III OSD M1:2 with a length of 64mm, is 9mm shorter. On the other hand, the Tamron 35mm F2.8 Di III OSD M1:2 has a larger diameter of 73mm compared to the Sigma 30mm F1.4 C's 65mm 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 35mm F2.8 Di III OSD M1:2 weighs 210g, which means it is 55g (20%) lighter than the Sigma 30mm F1.4 C which has a weight of 265g.
Filter Threads
The Tamron 35mm F2.8 Di III OSD M1:2 has a filter size of 67mm whereas the Sigma 30mm F1.4 C has a 52mm 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 35mm F2.8 Di III OSD M1:2:
And these are the 52mm filters that we recommend for the Sigma 30mm F1.4 C:
Lens Mounts
Both the Tamron 35mm F2.8 Di III OSD M1:2 and the Sigma 30mm F1.4 C has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony FX5, Sony A7R VI and Sony A7 V.
Sigma 30mm F1.4 C is also available in Micro Four Thirds , Fujifilm X, Nikon Z, Leica L and Canon RF mounts.
Focal Range
Tamron 35mm F2.8 Di III OSD M1:2 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.
On the other hand, the Sigma 30mm F1.4 C is a prime lens with fixed focal lenght of 30mm which has an effective (full-frame 35mm equivalent) focal range of 45mm when used on a APS-C / DX format camera.
