The type of photography that you are planning to use is an important decision factor. Here we have evaluated the 7artisans 35mm F2 and the Sigma 30mm F2.8 EX 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. 7artisans 35mm F2 is the longer of the two lenses at 41mm. The Sigma 30mm F2.8 EX DN with a length of 39mm, is 2mm shorter. On the other hand, the Sigma 30mm F2.8 EX DN has a larger diameter of 61mm compared to the 7artisans 35mm F2's 50mm 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, 57% (185g) lighter than the 7artisans 35mm F2's weight of 320g.
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
Filter Threads
The 7artisans 35mm F2 has a filter size of 43mm whereas the Sigma 30mm F2.8 EX DN has a 46mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 43mm filters that we recommend you to consider for the 7artisans 35mm F2:
And these are the 46mm filters that we recommend for the Sigma 30mm F2.8 EX DN:
Lens Mounts
Both the 7artisans 35mm F2 and the Sigma 30mm F2.8 EX 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.
7artisans 35mm F2 is also available in Canon EF-M and Fujifilm X mounts.
Sigma 30mm F2.8 EX DN is also available in Micro Four Thirds mount.
Focal Range
7artisans 35mm F2 is a prime lens with fixed focal lenght of 35mm which has an effective (full-frame 35mm equivalent) focal range of
52.5mm when used on a APS-C / DX format camera.
On the other hand, the 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.