The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Kamlan 55mm F1.2 and the Sigma 24-70mm F2.8 II for their suitability to various photography scenarios:
Size and Weight Comparison
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. Kamlan 55mm F1.2 weighs 700g, which means it is 35g (4%) lighter than the Sigma 24-70mm F2.8 II which has a weight of 735g.
Filter Threads
The Kamlan 55mm F1.2 has a filter size of 62mm whereas the Sigma 24-70mm F2.8 II has a 82mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 62mm filters that we recommend you to consider for the Kamlan 55mm F1.2:
And these are the 82mm filters that we recommend for the Sigma 24-70mm F2.8 II:
Lens Mounts
Both the Kamlan 55mm F1.2 and the Sigma 24-70mm F2.8 II 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 24-70mm F2.8 II is also available in Leica L mount.
Focal Range
Kamlan 55mm F1.2 is a prime lens with fixed focal lenght of 50mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
75mm.
On the other hand, the Sigma 24-70mm F2.8 II has a focal range of 24-70mm and 2.9X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 36 - 105mm.
