Surveying
In a truly vertical photograph,

Principal point coincides the isocenter
Plumb point coincides the principal point
All listed here
Iso-centre coincides the plumb point

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Surveying
The cross hairs in the surveying telescope are placed

much closer to the objective lens than to the eye piece
midway between eye piece and objec-tive lens
anywhere between eye-piece and objective lens
much closer to the eye-piece than to the objective lens

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