its a sigma lens with a nikon mount so doubt it would be very useful for you tbh
as for whats wrong - no idea just cant take a sharp photo - it always comes out blurry
i am going to do some testing to see if it gets better/worse at different focal lengths
and then if it gets better/worse at different apertures but i think something inside is stuffed
i.e. a one of the elements isn't quite strait or something
(dont know much about what can go wrong with a lens)