Carl Zeiss Biogon T* 21mm F/2.8 ZM (for Leica M mount) Black -MINT- #104
26 Oct, 2020
Great entree level lens
Corners are a little fuzzy and drops lights but it gets sharp and equal exposure at f8.
Use f2.8 on purpose to get unique effect as well. Distortion is minimal so it works pretty well for architectures.