The type of photography that you are planning to use is an important decision factor. Here we have evaluated the OM System 25mm F1.8 II and the Voigtlander Nokton 42.5mm 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 42.5mm F0.95 is the longer of the two lenses at 75mm. The OM System 25mm F1.8 II with a length of 41mm, is 34mm shorter. Besides being longer, the Voigtlander Nokton 42.5mm F0.95 also has a larger diameter of 64mm compared to the OM System 25mm F1.8 II's 56mm 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. OM System 25mm F1.8 II weighs 156g, which means it is 415g (72%) lighter than the Voigtlander Nokton 42.5mm F0.95 which has a weight of 571g.
Below you can find the dimension and weight table of the Standard Prime Lenses in Micro Four Thirds Mount for size comparison purposes.
Standard Lenses in Micro Four Thirds Mount for Size Comparison
Filter Threads
The OM System 25mm F1.8 II has a filter size of 46mm whereas the Voigtlander Nokton 42.5mm F0.95 has a 58mm 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 25mm F1.8 II:
And these are the 58mm filters that we recommend for the Voigtlander Nokton 42.5mm F0.95:
Lens Mounts
Both the OM System 25mm F1.8 II and the Voigtlander Nokton 42.5mm 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 25mm F1.8 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.
On the other hand, the Voigtlander Nokton 42.5mm F0.95 is a prime lens with fixed focal lenght of 43mm which has an effective (full-frame 35mm equivalent) focal range of 86mm when used on a FourThirds format camera.
