The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Viltrox 23mm F1.4 X 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. Viltrox 23mm F1.4 X is the longer of the two lenses at 72mm. The Sigma 30mm F2.8 EX DN with a length of 39mm, is 33mm shorter. Besides being longer, the Viltrox 23mm F1.4 X also has a larger diameter of 65mm compared to the Sigma 30mm F2.8 EX DN's 61mm 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, 48% (125g) lighter than the Viltrox 23mm F1.4 X's weight of 260g.
Filter Threads
The Viltrox 23mm F1.4 X has a filter size of 52mm 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 52mm filters that we recommend you to consider for the Viltrox 23mm F1.4 X:
And these are the 46mm filters that we recommend for the Sigma 30mm F2.8 EX DN:
Lens Mounts
The Viltrox 23mm F1.4 X has the Fujifilm X lens mount whereas the Sigma 30mm F2.8 EX DN has the Sony E lens mount. Some of the latest released cameras that are compatible with these mounts are Fujifilm X-T30 III, Fujifilm X-E5 and Fujifilm X-M5 for the Fujifilm X Mount and Sony ZV-E10 II, Sony A6700 and Sony FX30 for the Sony E Mount.
Sigma 30mm F2.8 EX DN is also available in Micro Four Thirds mount.
Focal Range
Viltrox 23mm F1.4 X is a prime lens with fixed focal lenght of 23mm which has an effective (full-frame 35mm equivalent) focal range of
34.5mm 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.
