The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Panasonic Leica 15mm F1.7 and the Voigtlander Nokton 17.5mm F0.95 ASPH 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 17.5mm F0.95 ASPH is the longer of the two lenses at 80mm. The Panasonic Leica 15mm F1.7 with a length of 36mm, is 44mm shorter. Besides being longer, the Voigtlander Nokton 17.5mm F0.95 ASPH also has a larger diameter of 63mm compared to the Panasonic Leica 15mm F1.7's 58mm 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. Panasonic Leica 15mm F1.7 weighs 115g, which means it is 425g (78%) lighter than the Voigtlander Nokton 17.5mm F0.95 ASPH which has a weight of 540g.
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 Panasonic Leica 15mm F1.7 has a filter size of 46mm whereas the Voigtlander Nokton 17.5mm F0.95 ASPH 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 Panasonic Leica 15mm F1.7:
And these are the 58mm filters that we recommend for the Voigtlander Nokton 17.5mm F0.95 ASPH:
Lens Mounts
Both the Panasonic Leica 15mm F1.7 and the Voigtlander Nokton 17.5mm F0.95 ASPH 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-1 II, Panasonic G9 II and OM System OM-5.
Focal Range
Panasonic Leica 15mm F1.7 is a prime lens with fixed focal lenght of 15mm which has an effective (full-frame 35mm equivalent) focal range of
30mm when used on a FourThirds format camera.
On the other hand, the Voigtlander Nokton 17.5mm F0.95 ASPH is a prime lens with fixed focal lenght of 18mm which has an effective (full-frame 35mm equivalent) focal range of 36mm when used on a FourThirds format camera.