The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Carl Zeiss Touit 1.8/32 and the Sigma 30mm F2.8 DN 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. Carl Zeiss Touit 1.8/32 is the longer of the two lenses at 60mm. The Sigma 30mm F2.8 DN with a length of 41mm, is 19mm shorter. Besides being longer, the Carl Zeiss Touit 1.8/32 also has a larger diameter of 65mm compared to the Sigma 30mm F2.8 DN's 61mm 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. Sigma 30mm F2.8 DN weighs 135g, 35% (75g) lighter than the Carl Zeiss Touit 1.8/32's weight of 210g.
Below you can find the dimension and weight table of the Standard Prime Lenses in Sony E Mount for size comparison purposes.
Standard Lenses in Sony E Mount for Size Comparison
Lens Mounts
Both the Carl Zeiss Touit 1.8/32 and the Sigma 30mm F2.8 DN has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony A6700, Sony FX30 and Sony ZV-E10.
Carl Zeiss Touit 1.8/32 is also available in Fujifilm X mount.
Sigma 30mm F2.8 DN is also available in Micro Four Thirds mount.
Focal Range
Carl Zeiss Touit 1.8/32 is a prime lens with fixed focal lenght of 32mm which has an effective (full-frame 35mm equivalent) focal range of
48mm when used on a APS-C / DX format camera.
On the other hand, the Sigma 30mm F2.8 DN 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.