In spite of the fact that 28mm has never been one of my favorite focal lengths for 35mm cameras, I have a few of them.
A. Nikkor 28mm f/3.5 pre-AI (use in reverse position on bellows for close-ups and macros)
B. Zeiss 28mm f/2 Distagon T* ZF 2 (replaced slower 28mm f/2.8 AIS Nikkor)
C. Vivitar 28mm f/2.5 screw mount lens (replaced broken 28mm f/3.5 Fujinon)
D. Nikkor 28mm f/4 perspective control (use for panoramic and architectural photos)
E. Asahi 28mm f/3.5 Super-Multi-Coated Takumar screw mount
F. Nikkor 28mm f/2.8 AIS (not shown)
G. Zeiss 28mm f/2.8 Biogon for Contax rangefinder (not shown)