eos 550d

Hi all I recently took a couple of interior pictures of a room which posed a difficult challenge lighting wise. It was relatively low light, so I had to turn on the chandeliers and open the blinds. The trouble is the top of the images look ultra bright, while the lower sections look kind of...

Can anyone please tell me for sure if i need to apply the 1.6 crop factor to this lens as it is specially made for a cropped body as someone has pointed out ? which would make it roughly 16-32mm by my maths on a Canon cropped body?. Or not as its built specially for the ultra wide to be...