The type of photography that you are planning to use is an important decision factor. Here we have evaluated the 7artisans 25mm F1.8 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. Sigma 30mm F2.8 DN is the longer of the two lenses at 41mm. The 7artisans 25mm F1.8 with a length of 32mm, is 9mm shorter. Besides being longer, the Sigma 30mm F2.8 DN also has a larger diameter of 61mm compared to the 7artisans 25mm F1.8's 51mm 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, 5% (8g) lighter than the 7artisans 25mm F1.8's weight of 143g.
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 7artisans 25mm F1.8 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.
7artisans 25mm F1.8 is also available in Canon EF-M , Fujifilm X and Micro Four Thirds mounts.
Sigma 30mm F2.8 DN is also available in Micro Four Thirds mount.
Focal Range
7artisans 25mm F1.8 is a prime lens with fixed focal lenght of 25mm which has an effective (full-frame 35mm equivalent) focal range of
37.5mm 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.