For lenses with a 62mm front thread size, the BR-5 (62mm to 52mm internal thread step-down) adaptor can be attached between the front of the lens and the BR-2A lens reversing ring. 

At right, Reverse-mounted 28mm lens (52mm thread-size) using the BR2A.

Note that the other version of the Lens Reversing Ring, the BR-2, can only be used with the manual bodies that DO NOT HAVE the electronic contacts found on the old and new AF bodies (excluding the F3AF). 

The BR-2A adaptor has been designed specifically for AF bodies, while still compatible with the older MF bodies, by ensuring that the lens' electronic contacts do not come into contact with the adaptor when it is mounted onto the camera body.

At right, a reverse-mounted 20mm lens (62mm thread-size) using the BR2a & BR-5.