Until now we have been using the OV5647 image sensor, the biggest advantage of which was that it could handle up to 90FPS, but we were not satisfied with the image quality. 

As an alternative, we obtained a small sensor unit with an IMX219 sensor. It is possible to divert the Raspberry Pi camera V2 board and replace only the sensor unit.
There is one problem, the MIPI connector on the Raspberry Pi camera V2 is 1mm pitch x 15PIN, but the Raspberry Pi zero is 0.5mm pitch x 22PIN, so a conversion cable is required.
The conversion cable we obtained was too long to fit into the case, so we modified it to cut the cable at the same time.
The Raspberry Pi camera V2 board is also in the way, but if the placement of the main board is improved, it will fit in.