APS lens on FF!!

You might have seen those posts were people tried Canon´s 10-22 or Sigma 10-20 in FF cams.. At 10mm there is the strong vignetting, but from 16 to 22mm it´s almost gone, with the lens covering all the frame.

Also Sigma 30f1.4 is said to cover 1.3x completely.

Has anyone tried Tamron/Sigma 17-50, Canon 17-55, tokina 16-50 lenses in a FF cam??? If so, i imagine there will be strong vignetting at 17mm, but does the lens covers the FF at 50mm?? (as the 10-22 does at 22), and if so, at what focal does it begins to cover the full frame (20mm or so??)

I know this will sound strange to some, so please don´t tell me aps lens are not designed for FF.. blablabla, i know