just 
wondering if any one else has this set up, how much distortion would you expect from this.
have taken some pictures of sea side looking out to sea, the horizon has a distinct bow towards both sides, it is enough to see it.
i was wondering if this is normal or not and needing rectified.
i have been using a 30d and 10 20 siggy there didnt appear to be any distortion to the extent of the d700.
advice welcome.

wondering if any one else has this set up, how much distortion would you expect from this.have taken some pictures of sea side looking out to sea, the horizon has a distinct bow towards both sides, it is enough to see it.
i was wondering if this is normal or not and needing rectified.
i have been using a 30d and 10 20 siggy there didnt appear to be any distortion to the extent of the d700.
advice welcome.