I have already given my entire limited knowledge on Optical Flow in the link below. However, there are others with much more knowledge and experience on this subject. As you may already be aware, a better sensor than the MB1242 will cost more.
Thanks you for the info you sent me… me im having also a mb 1202 can i ask you pls if you can give me few info for the wiring and the setup on mission planner coz me uve follow the guide ive found but without results