21mm f4.5 C Biogon T*, ZM/Leica M mount, black

Not content with one 21mm ZM lens, Zeiss have added a smaller and lighter compact f4.5 version to complement the faster f2.8 model.
The 21/4.5 C Biogon is an exceptionally compact and unique super wide-angle lens. Like its classic predecessor from 1952, the optical performance is stellar and destined for similar greatness.
Updated with the most recent high performance optical glass types and the Carl Zeiss quality
assurance methods, the image quality exceeds that of today's best colour films and exhibits virtually no
distortion. The 21mm C Biogon has a filter size of only 46mm and is remarkably small and lightweight, making it the ideal super wide-angle for travelling.