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We can say that the distance between the prism (or mirror) of OAG and sensor of main camera must be equal to the distance between the prims (or mirror) of OAG and sensor of secondary camera.
A fine adjustment can be done by the adjustment ressource of the OAG.
Focal length is focal length, for both cameras. Maybe you will need some spacers to secondary camera to make them equal.
The prism or mirror of OAG may be positionned out of the field of sensor of main camera. It will take information of the periphery of total field. If the prism or mirror of OAG is postionned in front of sensor you will see a less bright area on the final photo due to obstruction of partial or total light information by prims or mirror.
There will be a great offset between what main camera will see and what the secondary camera will see. For example: with my set of instrument if I am shotting beta Crux the secondary camera will be seeing the Jewel Box Cluster.
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