Introduced in 2002 by Kyocera, the Contax NX was the less expensive, junior partner to the professional-grade Contax N1. Despite this secondary status, the NX is a feature-rich autofocus SLR that has a lot going for it, even if you don't count the fact that it makes use of Carl Zeiss lenses.
The Contax NX has just about everything you would expect it to have. There are multiple ways to set exposure: manual, program, aperture and shutter priority. There are various focus modes: manual, single AF, and continuous AF. The autofocus locks onto one of five points within the viewfinder, which are easily prioritized via a small toggle under your thumb on the back of the camera. Metering can be done via TTL evaluative, center-weighted average or 3% spot. There is single frame or continuous frame film advance (up to 2.3 fps) and a 10 second self timer. Heck the NX even has a built-in flash that allows you to easily switch between front or rear curtain sync.
Of course most Contax NX users will tell you the real star of the show are the Carl Zeiss lenses you put on this camera. Contax (and Yashica) have long enjoyed a degree of fame for sporting some of the finest optics one can find on a camera. Zeiss lenses really are all that they are made out to be and the Carl Zeiss lenses found in the N system are no different.
Yes, the NX is a fairly big and not the prettiest camera you will venture across. And yes, the Contax N-mount is also not the easiest lens to find. But the NX has a lot going for it and is a relatively inexpensive way to get into an SLR system using Carl Zeiss lenses.