Nikon D1X has a
5.0MP APS-C (23.7 x 15.5 mm ) sized CCD sensor . On the other hand, Nikon D200 has a
10.0MP APS-C (23.6 x 15.8 mm ) sized CCD sensor .
Nikon D200's sensor provides 5MP more than Nikon D1X's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the D1X and D200 sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon D1X and Nikon D200 Cameras
Nikon D1X and Nikon D200 have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the same focal length and aperture.
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Nikon D1X
or the
Nikon D200 ,
including hyperfocal distance.