What is the difference: Z4XC vs Z4XB

Z4XC is the upgraded version of Z3XB

Design and build

The Z4XC is pretty much identical to the Z4XB in terms of design and build, just as you can see from the pictures.
Both Z4XB & Z4XC is using 4 cameras with a very similar mount.

Lenses

The Z4XC has a major advantage over the Z4XB when it comes to lenses

The Z4XB is using the orginal iZugar MKX13 Fisheye lenses with FOV185.
The iZugar MKX13 Fisheye lenses is the first mini 185 fisheye lens rated at 10MP, it provides right enough overlapping for stitching and high resolution.

The upgraded Z4XC is using iZugar MKX19 Fisheye lenses with FOV194.
The iZugar MKX19 Fisheye lenses provides more overlapping which make the stitching result and color blending more promising.
This special FOV194 fisheye lenses that designed and manufactured by iZugar is a almost theta lens, which make it possible to restore the image in an undistorted way.