The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 28-70mm F2.8 DG DN and the Voigtlander Nokton 25mm F0.95 Type II 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 28-70mm F2.8 DG DN is the longer of the two lenses at 102mm. The Voigtlander Nokton 25mm F0.95 Type II with a length of 70mm, is 32mm shorter. Besides being longer, the Sigma 28-70mm F2.8 DG DN also has a larger diameter of 72mm compared to the Voigtlander Nokton 25mm F0.95 Type II'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. Voigtlander Nokton 25mm F0.95 Type II weighs 435g, 7% (35g) lighter than the Sigma 28-70mm F2.8 DG DN's weight of 470g.
Filter Threads
The Sigma 28-70mm F2.8 DG DN has a filter size of 67mm whereas the Voigtlander Nokton 25mm F0.95 Type II has a 52mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 67mm filters that we recommend you to consider for the Sigma 28-70mm F2.8 DG DN:
And these are the 52mm filters that we recommend for the Voigtlander Nokton 25mm F0.95 Type II:
Lens Mounts
The Sigma 28-70mm F2.8 DG DN has the Sony E lens mount whereas the Voigtlander Nokton 25mm F0.95 Type II has the Micro Four Thirds lens mount. Some of the latest released cameras that are compatible with these mounts are Sony FX5, Sony A7R VI and Sony A7 V for the Sony E Mount and OM System OM-3 Astro, OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount.
Focal Range
Sigma 28-70mm F2.8 DG DN has a focal range of 28-70mm and
2.5X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
42 - 105mm.
On the other hand, the Voigtlander Nokton 25mm F0.95 Type II is a prime lens with fixed focal lenght of 25mm which has an effective (full-frame 35mm equivalent) focal range of 50mm when used on a FourThirds format camera.
