Hi Marcial.

From the other thread, I know you are using a D90.

I believe what you want is the Viewfinder Grid Display.
Check page 181 of your manual; it seems to be the d2: option of your menu. I haven't used it as yet.

And, to help with the images you have already, check
page 221. It should allow you to rotate a copy of your original
image in .025 degree increments, up to five degrees in total.
And, again, I haven't tried it.

Hope this helps.

Terry.

OnTERRYo

"The Nikon did the work; I just happened to be behind it at the time." TP