Architectural advice

[Frank Fremerey]

IMO the camera position is to low. Try to  position the camera at mid height of the hall.

Use a water or spirit balance to check all room angles for level accuracy .

Use the camera in vertical position on a non parallax head to gain max image height.

Straighten our all lens distortion before rendering the image in Mercator or Cylidrical projection.

http://fotokontext.de/Studiosaal_mit_Sitzplaetzen_fuer_ueber_500_Personen_Musikauffuehrungen_Diners_und_andere_Veranstaltungen_sind_Hier_moeglich_Fremerey_2011_Architekturfotografie.html

[Jacques Pochoy]

Exactly... :-)