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911. How do TTG photographers make “perspective-corrected” photographs if they can’t reshape things after the light passes through the lens?

The same way perspective correction has been done since photography was invented:

by keeping the sensor/film plane parallel to the subject* and using only a portion of the camera’s image circle.

This can be achieved

• by using a wide-angle lens and cropping out any undesired portion of the result; or

• with a shift [rise] “PC” lens; or

• with a view camera.

*Since most buildings are exactly vertical, when vertical perspective correction is desired, the sensor/film plane is also kept exactly vertical (that is, “parallel to the subject”).

The same principle — keeping the sensor/film plane parallel to the subject — works for horizontal perspective correction, although that effect is less commonly seen outside of product photography.