The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Voigtlander Ultron 27mm F2 and the Fujifilm 23mm F2.8 for their suitability to various photography scenarios:
Size and Weight Comparison
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. Fujifilm 23mm F2.8 weighs 90g, 25% (30g) lighter than the Voigtlander Ultron 27mm F2's weight of 120g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Fujifilm X Mount for size comparison purposes.
Wideangle Lenses in Fujifilm X Mount for Size Comparison
Filter Threads
The Voigtlander Ultron 27mm F2 has a filter size of 43mm whereas the Fujifilm 23mm F2.8 has a 39mm 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 Voigtlander Ultron 27mm F2:
And these are the 39mm filters that we recommend for the Fujifilm 23mm F2.8:
Lens Mounts
Both the Voigtlander Ultron 27mm F2 and the Fujifilm 23mm F2.8 has the same Fujifilm X lens mount. Some of the latest released cameras that are compatible with the Fujifilm X lenses are Fujifilm X-T30 III, Fujifilm X-E5 and Fujifilm X-M5.
Focal Range
Voigtlander Ultron 27mm F2 is a prime lens with fixed focal lenght of 28mm which has an effective (full-frame 35mm equivalent) focal range of
40.5mm when used on a APS-C / DX format camera.
On the other hand, the Fujifilm 23mm F2.8 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.