The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Zeiss Batis 25mm F2 and the Sigma 30mm F2.8 EX DN for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Zeiss Batis 25mm F2 is the longer of the two lenses at 78mm. The Sigma 30mm F2.8 EX DN with a length of 39mm is 39mm shorter. Besides being longer, the Zeiss Batis 25mm F2 also has a larger diameter of 92mm compared to Sigma 30mm F2.8 EX DN's 61mm diameter.
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Sigma 30mm F2.8 EX DN weighs 135g, 59% (200g) lighter than the Zeiss Batis 25mm F2's weight of 335g.
Both Zeiss Batis 25mm F2 and 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 A7R V, Sony FX30 and Sony A7 IV.
Sigma 30mm F2.8 EX DN is also available in Micro Four Thirds mount.
Zeiss Batis 25mm F2 is a prime lens with fixed focal lenght of 25mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 37.5mm.
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.