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Either way, you need to record accurately the position of the bolt. You need to add/
minus this value when you do the axial adjustment. To make life simple, you may want to
mount the adapter to the nearest cm, say 3 cm from the adapter socket. Remember this distance
is measured from the center of the bolt. So you may want to wind / unwind the bolt till the slot
of the bolt is perpendicular to rim of the adapter. Then check the accuracy of the position with a
straight object. Again, you can mark the position of the bolt on the adapter for future use. Then
mount your camera to the vertical rotator arm.
Slide the camera to the correct position, taking the off-set by the adapter into account.
Again take the choice of the adapter into account for the horizontal adjustment. Level the
assembly and start shooting.
The entrance pupil position is usually in front of the tripod mount for wide angle lens or
zoom lens at the wide end; and behind the tripod mount for telephoto lens or zoom lens at the
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