The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 35mm F1.8 Di VC USD and the Sony DT 30mm F2.8 Macro SAM for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Tamron 35mm F1.8 Di VC USD is the longer of the two lenses at 81mm. The Sony DT 30mm F2.8 Macro SAM with a length of 45mm is 36mm shorter. Besides being longer, the Tamron 35mm F1.8 Di VC USD also has a larger diameter of 80mm compared to Sony DT 30mm F2.8 Macro SAM's 70mm diameter.
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Sony DT 30mm F2.8 Macro SAM weighs 150g, 66% (300g) lighter than the Tamron 35mm F1.8 Di VC USD's weight of 450g.
Lens Mounts
Both Tamron 35mm F1.8 Di VC USD and Sony DT 30mm F2.8 Macro SAM has the same Sony Alpha lens mount. Some of the latest released cameras that are compatible with the Sony Alpha lenses are Sony A99 II, Sony A68 and Sony A77 II.
Tamron 35mm F1.8 Di VC USD is also available in Canon EF and Nikon F (FX) mounts.
Focal Range
Tamron 35mm F1.8 Di VC USD 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 an 35mm (FF) equivalent of 52.5mm.
Sony DT 30mm F2.8 Macro SAM 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.