It's All About the Lens

According to Ian Austen at New York Times, it's a brave new world when it comes to camera lenses:

Nikon alone sells 51 different lenses in the United States for its cameras, while Canon has 54 offerings. Still not enough? Several companies, notably Tamron and Sigma, have their own complete lineups of lenses to fit most brand-name cameras.

--Tweaking the Zoom - New York Times

[Via HDforIndies. As Mike there alludes, new video cameras like RED will allow the use of photo lens adapters.]