Surveying
In a truly vertical photograph,

All listed here
Plumb point coincides the principal point
Principal point coincides the isocenter
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
much closer to the eye-piece than to the objective lens
anywhere between eye-piece and objective lens
midway between eye piece and objec-tive lens

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