Yashica Electro 35 GSN

1973 45mm f/1.7 rangefinder.
Nikon D80
Used often with the 50mm f/1.8. Great except that at f/1.8 I often have to use -0.7 exposure compensation and at f/2 often -1.0!
Canon G2
2001 model, but great because of its f/2.0 max. aperture. Meter is better than my Nikon D80, which without compensation overexposes almost every photo with every lens.

f/1.8 max. aperture
I use these for the purpose of photography, although the Yashica would also be good for self-defense.