The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 30mm F2.8 EX DN and the Kamlan 28mm F1.4 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. Kamlan 28mm F1.4 is the longer of the two lenses at 65mm. The Sigma 30mm F2.8 EX DN with a length of 39mm, is 26mm shorter. On the other hand, the Sigma 30mm F2.8 EX DN has a larger diameter of 61mm compared to the Kamlan 28mm F1.4's 55mm 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 EX DN weighs 135g, which means it is 249g (64%) lighter than the Kamlan 28mm F1.4 which has a weight of 384g.
Filter Threads
The Sigma 30mm F2.8 EX DN has a filter size of 46mm whereas the Kamlan 28mm F1.4 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 46mm filters that we recommend you to consider for the Sigma 30mm F2.8 EX DN:
And these are the 52mm filters that we recommend for the Kamlan 28mm F1.4:
Lens Mounts
Both the Sigma 30mm F2.8 EX DN and the Kamlan 28mm F1.4 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.
Sigma 30mm F2.8 EX DN is also available in Micro Four Thirds mount.
Kamlan 28mm F1.4 is also available in Canon EF-M , Fujifilm X and Micro Four Thirds mounts.
Focal Range
Sigma 30mm F2.8 EX 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.
On the other hand, the Kamlan 28mm F1.4 is a prime lens with fixed focal lenght of 28mm which has an effective (full-frame 35mm equivalent) focal range of 42mm when used on a APS-C / DX format camera.