The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony 28-75mm F2.8 SAM and the Carl Zeiss Touit 1.8/32 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 28-75mm F2.8 SAM is the longer of the two lenses at 98mm. The Carl Zeiss Touit 1.8/32 with a length of 60mm, is 38mm shorter. Besides being longer, the Sony 28-75mm F2.8 SAM also has a larger diameter of 78mm compared to the Carl Zeiss Touit 1.8/32'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. Carl Zeiss Touit 1.8/32 weighs 210g, 62% (355g) lighter than the Sony 28-75mm F2.8 SAM's weight of 565g.
Filter Threads
The Sony 28-75mm F2.8 SAM has a filter size of 67mm whereas the Carl Zeiss Touit 1.8/32 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 Sony 28-75mm F2.8 SAM:
And these are the 52mm filters that we recommend for the Carl Zeiss Touit 1.8/32:
Lens Mounts
The Sony 28-75mm F2.8 SAM has the Sony Alpha lens mount whereas the Carl Zeiss Touit 1.8/32 has the Sony E lens mount. Some of the latest released cameras that are compatible with these mounts are Sony A99 II, Sony A68 and Sony A77 II for the Sony Alpha Mount and Sony A6700, Sony FX30 and Sony ZV-E10 for the Sony E Mount.
Carl Zeiss Touit 1.8/32 is also available in Fujifilm X mount.
Focal Range
Sony 28-75mm F2.8 SAM has a focal range of 28-75mm and
2.7X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
42 - 112.5mm.
On the other hand, the 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.