The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 30mm F1.4 C and the Venus 25mm F2.8 2.5-5X Ultra Macro 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 F1.4 C is the longer of the two lenses at 73mm. The Venus 25mm F2.8 2.5-5X Ultra Macro with a length of 65mm, is 8mm shorter. On the other hand, the Venus 25mm F2.8 2.5-5X Ultra Macro has a larger diameter of 82mm compared to the Sigma 30mm F1.4 C's 65mm diameter.
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Below you can find a scaled side-by-side image of Sigma 30mm F1.4 C and Venus 25mm F2.8 2.5-5X Ultra Macro to get a better idea of how their sizes compare in real life.
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 F1.4 C weighs 265g, which means it is 135g (33%) lighter than the Venus 25mm F2.8 2.5-5X Ultra Macro which has a weight of 400g.
Lens Mounts
Both the Sigma 30mm F1.4 C and the Venus 25mm F2.8 2.5-5X Ultra Macro 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 F1.4 C is also available in Micro Four Thirds , Fujifilm X and Nikon Z mounts.
Venus 25mm F2.8 2.5-5X Ultra Macro is also available in Canon EF , Nikon F (DX) and Pentax KAF2 mounts.
Focal Range
Sigma 30mm F1.4 C 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 Venus 25mm F2.8 2.5-5X Ultra Macro 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 a 35mm (FF) equivalent of 37.5mm.