The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Voigtlander 28mm F2 Ultron and the Carl Zeiss Biogon T2,8/25 ZM for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Carl Zeiss Biogon T2,8/25 ZM is the longer of the two lenses at 71mm. The Voigtlander 28mm F2 Ultron with a length of 51mm is 20mm shorter. On the other hand, the Voigtlander 28mm F2 Ultron has a larger diameter of 55mm compared to Carl Zeiss Biogon T2,8/25 ZM's 53mm diameter.
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Voigtlander 28mm F2 Ultron weighs 244g, which means it is 16g (6%) lighter than the Carl Zeiss Biogon T2,8/25 ZM which has a weight of 260g.
Below you can find the dimension and weight table of the 'Wideangle Prime Lenses in Leica M Mount for size comparison purposes.
Wideangle Prime Lenses in Leica M Mount for Size Comparison
Both Voigtlander 28mm F2 Ultron and Carl Zeiss Biogon T2,8/25 ZM has the same Leica M lens mount. Some of the latest released cameras that are compatible with the Leica M lenses are Leica M11, Leica M10 and Leica M Typ 262.
Voigtlander 28mm F2 Ultron is a prime lens with fixed focal lenght of 28mm. Carl Zeiss Biogon T2,8/25 ZM is a prime lens with fixed focal lenght of 25mm.