The type of photography that you are planning to use is an important decision factor. Here we have evaluated the OM System 17mm F1.8 II and the Voigtlander Nokton 25mm F0.95 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. Voigtlander Nokton 25mm F0.95 is the longer of the two lenses at 70mm. The OM System 17mm F1.8 II with a length of 36mm, is 34mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 58mm.
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. OM System 17mm F1.8 II weighs 112g, which means it is 298g (72%) lighter than the Voigtlander Nokton 25mm F0.95 which has a weight of 410g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Micro Four Thirds Mount for size comparison purposes.
Wideangle Lenses in Micro Four Thirds Mount for Size Comparison
Filter Threads
The OM System 17mm F1.8 II has a filter size of 46mm whereas the Voigtlander Nokton 25mm F0.95 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 46mm filters that we recommend you to consider for the OM System 17mm F1.8 II:
And these are the 52mm filters that we recommend for the Voigtlander Nokton 25mm F0.95:
Lens Mounts
Both the OM System 17mm F1.8 II and the Voigtlander Nokton 25mm F0.95 has the same Micro Four Thirds lens mount. Some of the latest released cameras that are compatible with the Micro Four Thirds lenses are OM System OM-3 Astro, OM System OM-5 II and OM System OM-3.
Focal Range
OM System 17mm F1.8 II is a prime lens with fixed focal lenght of 17mm which has an effective (full-frame 35mm equivalent) focal range of
34mm when used on a FourThirds format camera.
On the other hand, the Voigtlander Nokton 25mm F0.95 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.
