aperture - What is the fastest lens available for a DSLR?

I've seen references to f1.2 lenses. I was wondering, are there any faster lenses available for a DSLR mount?

Answer

are there any faster lenses available for a DSLR mount?

To answer your question, not really, though it's possible to argue based on your definition of DSLR and your definition of available.

If you relax your definition of DSLR to digital rangefinders, then yes, you can include the Leica Noctilux, which is still in production. And if you relax your definition of "available", Canon made a 50 f/1.0 for the EF mount which can be obtained second hand. There are also many more fast lenses that can be mounted via an adaptor.

But practically, the fastest production DSLR lenses are the Canon EF 85mm f/1.2L and EF 50mm f/1.2L, and the manual Nikon Nikkor 50mm f/1.2 AIS.