Its how I wanted it to look.

I bought a Sigma Fisheye lens earlier this year  (10mm f2.8) for those that are interested in those things) and I love it to bits, it can give you a photo thats markedly different to one taken by someone next to you using standard lenses.  As well as its great field of view in tight spaces, I like the way it distorts things providing extra  drama, and its this that is also problematic.  

A couple of times now people have looked at images produced with the lens and seen the distortion as an error that I've overlooked, and advised that I could correct the distortion Photoshop!  I'm always appreciative of comments positive or negative, but it is a little frustrating that people would think I'd present an image that was in need of that level of correction.

I've started now to let people know in advance that the distortion is there for a purpose and that I've not just been sloppy.

A case in point, in the comments of this  image of Senate House Passage in Cambridge, I stated in its comments that I'd left the distortion in to create a more oppressive feel, and thus far have had no comments back recommending I straighten it up. 

On the other hand I didn't say the distortion was deliberate on this one taken in Trinity Lane in Cambridge and someone took the time to comment which is great, that I should take out the distortion.  I did a version with no distortion but binned it as it was too "straight", the way the building looms over the bicycle just adds something.

See them full size at My Flickr Photostream