ok,

I think I ve installed now correctly the NN 180.

http://www.alvarezinmobiliaria.com/sal.htm

  Is there a number in the rotator arm, where should I place the t -adapter to rotate by 120.... Finally I am shooting RAW, manual mode, and I think I am doing ok... but Im still having too much trouble with PTgui,. .....

PTGui now automatically detect "circular" and "Hor field of view" 180.... but it doesnt blend nothing,  here are two, 180 degree shoots

http://www.alvarezinmobiliaria.com/image.jpg