I have both Canon 7d and 5D mark III camera bodies which I use for wedding photography.
Also own a Tokiana 11-16,2.8 as it's only ment for crop sensor camera'.
But on a full frame body it shows black area's between 11-13mm. Strangely back-end of the lens does not hit the sensor and have seen numerous videos on U tube that people use tokina 11-15 on full frame body.
was planning to buy a 8-15mm fisheye lens for a unique effect, can someone recommend that how different will it be from a 11-16mm. As I know that between 8-13mm on a full frame, it shows a circular black band and best results are are between 13-15mm