Hi MatYay, I am confused about the small 24-pin connector on the PCB. 

Is it a receptacle or a header? I mean, I guess the connector on the PCB you have designed is it to be used with an existing camera sensor as taken from an official Raspberry CameraModule v1.3?

The confusion arises from the part number you have put in the BOM, that is DF30FC-24DP-0.4V, but reading from the Datasheets the *DP* string in the name seems to mean a header, narrower, while the receptacle is DF30FC-24DS-0.4V, whose footprint matches yours in the kicad. 

You can read my discussion here

https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=277314&p=1680627#p1680627

and the DataSheet here

https://www.hirose.com/product/document?clcode=CL0684-1111-0-82&productname=DF30FC-24DS-0.4V(82)&series=DF30&documenttype=Catalog&lang=en&documentid=D48588_en

Yeah, you're right. But I'm not gonna use those cameras for stereo. Instead I want to fuse data from both of them together as if they were one. That's why they are that close.

But still the stereo baseline depends on scale. You can still use this setup to capture in stereo something that is small.

I'm confused - wouldn't you want the cameras further apart for stereo use?