Can you take pictures of vampires?

[Some friends are talking about pictures of a ghost.]
Someone (seriously): I didn't know you could take pictures of ghosts.
Me (joking): No, you're thinking of vampires.
Someone: Huh.
Me: It was a joke. But...since vampires can't see their reflection in a mirror...
Mary: And since cameras work by reflecting light off a small set of mirrors...
Me: You can't take pictures of vampires.

Although my research now indicates that since digital cameras work with electronic sensors, I believe you can take a picture of vampires with a digital.

(You know you're a nerd when...)